Tuesday

July 29, 2014

July 29, 2014

Posted by **Marina** on Monday, October 3, 2011 at 7:38am.

2.) -(x-y)^3

3.)3x^2-27(2-x)^2

4.) 9(y-1)^2-25

- Math help please -
**Reiny**, Monday, October 3, 2011 at 9:04am1. 4(2-a)^2 - 81 , difference of squares

= (2(2-a) + 9)(2(2-a) - 9)

=(4 - 2a +9)(4 -2a - 9)

= (-2a + 13)(-2a - 5)

or

(2a-13)(2a+5) , I wanted to start the brackets with a positive so I multiplies by (-1)(-1)

Do #4 the same way.

3.

3x^2 - 27(2-x)^2

= 3[x^2 - 9(2-x)} , again a difference of square

= 3(x - 3(2-x))(x + 3(2-x))

= 3(x - 6 + 3x)(x + 6 - 3x)

= 3(4x-6)(6-2x)

= 3(2)(2)(2x-3)(3-x)

= 12(2x-3)(3-x)

For #2,

-(x-)(x-y)(x-y)

= -(x-y)(x^2 - 2xy + y^2)

= - (x^3 - 2x^2y + xy^2 - yx^2 + 2xy^2 - y^3)

= - x^3 + 3yx^2 -3xy^2 + y^3

**Related Questions**

To Ms.Sue or any Math helpers - Can you please help me with my math law of ...

math please help!!!!!!!!! - Express the fractions 1/2, 3/16, and 7/8 with an ...

Math - Please help me math is boring and I'm a kinestetic learner please help ...

Math please help please help - Out of 42 kids in a class twice as many failed ...

math 098 - I made 3 f's on my tests in math 098, do you think i need to withdraw...

Math help please last question - Solve the equation. 10. 2(4x -4) + 2(3x + 2) = ...

INEED MATH HELP BADLY PLEASE HELP - CAN SOMEONE PLEASE HELP ME WITH MY SQUARE ...

math - please can you answer this is all about sums and differences of rational ...

mat115 - Please help me with this math question please. Am I correct in my ...

Math - Whats a consisnent. like suppose 2,3,6,9,8 Can someone help please? Can ...