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By Atul Joshi Rational Numbers Specific Formulas Special Formulas Perfect Squre And cube
 
In this presentation we will be studying special factoring formulas for: A)  Perfect Square Trinomials  B)  The difference of two squares C)  The sum or difference of two cubes.
A)  Perfect Square Trinomials
Perhaps you remember the formula for squaring a binomial: The right side of each of the above equations is called a “perfect square trinomial.” You can factor a perfect square trinomial by trial and error but, if you recognize the form, you can do the job easier and faster by using the factoring formula.
To factor a perfect square trinomial you look for certain clues: 1.  Is the first term a perfect square of the form a 2  for some expression a? 2.  Is the last term a perfect square of the form b 2  for some expression b? 3.  Is the middle term plus or minus 2 times the square root of a 2  times the square root of b 2 ? For example: Is the following a perfect square trinomial?
Is this term a perfect square? Yes. Is this term a perfect square? Yes. Is the middle term plus or minus 2 times the square root of x 2  times the square root of 1 2 ? x times 1 times 2 = 2x yes. Then this is a perfect square and factors into (x + 1) 2
See if you can recognize perfect square trinomials. Yes, this is  (x + 5) 2 Yes, this is  (x + 2) 2 Yes, this is  (3y - 2) 2 No, -36 is not a perfect square 1.  2.  3. 4.
Is the middle term 2 times the square root of  a 2  times the square root of b 2 to Rameshwaram is mandatory. Rameshwaram is also popularly referred to as the 'Benaras of the south'. Rameshwaram is significant  to Rameshwaram is mandatory. Rameshwaram is also popularly referred to as the 'Benaras of the south'. Rameshwaram is significant
 
 
Do all four before you go to the next slide.
 
B)  The Difference of Two Squares
In the  difference of two squares This side is expanded This side is factored. x (in the factored side) is the square root of x 2  and y (in the factored side) is the square root of y 2
Factoring the difference of two squares:  some examples.  Note:  The sum of two squares is not factorable .
Why does this binomial not factor? Suppose it did.  What would be the possible factors? No No There are no other possibilities, thus it doesn’t factor.  In general, the sum of two squares does not factor. No
Factoring the difference of two squares: Write out your answers before you go to the next page.
The solutions are:
Factoring the difference of two squares: Write down your solutions before going to the next page.
Factoring the difference of two squares: Here are the solutions.
C)  The sum or difference of two cubes
 
1000 is a perfect cube since 1000 = 10 3 125 is a perfect cube since 125 = 5 3 64 is a perfect cube since 64 = 4 3 8 is a perfect cube since 8 = 2 3 1 is a perfect cube since 1 = 1 3 In order to use these two formulas, you must be able to recognize numbers that are perfect cubes.
The following can be factored as the difference of two cubes:  letting a = 2x and b = 3 Let’s check with multiplication to see if the factors are correct:
 
A way to remember the formula a 3  + b 3  =  (  )(  ) a + b Cube root of a and b with same sign Clues to remember the formula: 1.  Cubes always factor into a binomial times a trinomial. 2.  The binomial in the factored version always contains the cube roots of the  original expression with the same sign that was used in the original expression. a 3  - b 3  =  (  )(  ) a - b Cube root of a and b with same sign
A way to remember the formula a 3  + b 3  =  (  )(  ) a + b a 2 1)Square first term -ab 2)Find the product of both terms and change the sign  i.e.  a(b) =ab change the sign = -ab +b 2 3)Square last term i.e. last term is b 2 Next you use the binomial to build your trinomial:
a 3  - b 3  =  (  )(  ) A binomial times a trinomial a - b Cube root of a and b with same sign a 2 1)Square first term +ab 2)Find the product of both terms and change the sign +b 2 3)Square last term The difference of two cubes:
Cube Numbers you will find in problems. 1 3 =1 2 3 =8 3 3 =27 4 3 =64 5 3 =125 etc 3 =etc
Difference of two cubes 8x 3  - 125=  (  )(  ) A binomial times a trinomial 2x - 5 Cube root of 1st and 2nd term with same sign 4x 2 1)Square first term +10x 2)Find the product of both terms and change the sign +25  3)Square last term Build trinomial with binomial.
Sum or Difference of two cubes 64x 3  + 1=  (  )(  ) A binomial times a trinomial 4x + 1 16x 2 -4x + 1  Build trinomial with binomial.
 
 
 
 
 

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solar system

  • 1. By Atul Joshi Rational Numbers Specific Formulas Special Formulas Perfect Squre And cube
  • 2.  
  • 3. In this presentation we will be studying special factoring formulas for: A) Perfect Square Trinomials B) The difference of two squares C) The sum or difference of two cubes.
  • 4. A) Perfect Square Trinomials
  • 5. Perhaps you remember the formula for squaring a binomial: The right side of each of the above equations is called a “perfect square trinomial.” You can factor a perfect square trinomial by trial and error but, if you recognize the form, you can do the job easier and faster by using the factoring formula.
  • 6. To factor a perfect square trinomial you look for certain clues: 1. Is the first term a perfect square of the form a 2 for some expression a? 2. Is the last term a perfect square of the form b 2 for some expression b? 3. Is the middle term plus or minus 2 times the square root of a 2 times the square root of b 2 ? For example: Is the following a perfect square trinomial?
  • 7. Is this term a perfect square? Yes. Is this term a perfect square? Yes. Is the middle term plus or minus 2 times the square root of x 2 times the square root of 1 2 ? x times 1 times 2 = 2x yes. Then this is a perfect square and factors into (x + 1) 2
  • 8. See if you can recognize perfect square trinomials. Yes, this is (x + 5) 2 Yes, this is (x + 2) 2 Yes, this is (3y - 2) 2 No, -36 is not a perfect square 1. 2. 3. 4.
  • 9. Is the middle term 2 times the square root of a 2 times the square root of b 2 to Rameshwaram is mandatory. Rameshwaram is also popularly referred to as the 'Benaras of the south'. Rameshwaram is significant to Rameshwaram is mandatory. Rameshwaram is also popularly referred to as the 'Benaras of the south'. Rameshwaram is significant
  • 10.  
  • 11.  
  • 12. Do all four before you go to the next slide.
  • 13.  
  • 14. B) The Difference of Two Squares
  • 15. In the difference of two squares This side is expanded This side is factored. x (in the factored side) is the square root of x 2 and y (in the factored side) is the square root of y 2
  • 16. Factoring the difference of two squares: some examples. Note: The sum of two squares is not factorable .
  • 17. Why does this binomial not factor? Suppose it did. What would be the possible factors? No No There are no other possibilities, thus it doesn’t factor. In general, the sum of two squares does not factor. No
  • 18. Factoring the difference of two squares: Write out your answers before you go to the next page.
  • 20. Factoring the difference of two squares: Write down your solutions before going to the next page.
  • 21. Factoring the difference of two squares: Here are the solutions.
  • 22. C) The sum or difference of two cubes
  • 23.  
  • 24. 1000 is a perfect cube since 1000 = 10 3 125 is a perfect cube since 125 = 5 3 64 is a perfect cube since 64 = 4 3 8 is a perfect cube since 8 = 2 3 1 is a perfect cube since 1 = 1 3 In order to use these two formulas, you must be able to recognize numbers that are perfect cubes.
  • 25. The following can be factored as the difference of two cubes: letting a = 2x and b = 3 Let’s check with multiplication to see if the factors are correct:
  • 26.  
  • 27. A way to remember the formula a 3 + b 3 = ( )( ) a + b Cube root of a and b with same sign Clues to remember the formula: 1. Cubes always factor into a binomial times a trinomial. 2. The binomial in the factored version always contains the cube roots of the original expression with the same sign that was used in the original expression. a 3 - b 3 = ( )( ) a - b Cube root of a and b with same sign
  • 28. A way to remember the formula a 3 + b 3 = ( )( ) a + b a 2 1)Square first term -ab 2)Find the product of both terms and change the sign i.e. a(b) =ab change the sign = -ab +b 2 3)Square last term i.e. last term is b 2 Next you use the binomial to build your trinomial:
  • 29. a 3 - b 3 = ( )( ) A binomial times a trinomial a - b Cube root of a and b with same sign a 2 1)Square first term +ab 2)Find the product of both terms and change the sign +b 2 3)Square last term The difference of two cubes:
  • 30. Cube Numbers you will find in problems. 1 3 =1 2 3 =8 3 3 =27 4 3 =64 5 3 =125 etc 3 =etc
  • 31. Difference of two cubes 8x 3 - 125= ( )( ) A binomial times a trinomial 2x - 5 Cube root of 1st and 2nd term with same sign 4x 2 1)Square first term +10x 2)Find the product of both terms and change the sign +25 3)Square last term Build trinomial with binomial.
  • 32. Sum or Difference of two cubes 64x 3 + 1= ( )( ) A binomial times a trinomial 4x + 1 16x 2 -4x + 1 Build trinomial with binomial.
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