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Posted by **Melissa** on Sunday, October 2, 2011 at 2:28am.

1. 8a^2-2ab-21b^2

2. 6m^2-90m+324

3.5x(2-x)+4x(2x-5)-(3x-4)

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

5. 3x^2-27(2-x)^2

- Math -
**Steve**, Sunday, October 2, 2011 at 11:59pm4. 9(y-1)^2 - 25 = [3(y-1)]^2 - 5^2

= [3(y-1)+5]*[3(y-1)-5]

= (3y-2)(3y-8)

5. 3x^2 - 27(2-x)^2

= 3[x^2 - 9(2-x)^2]

= 3[x^2 - [3(2-x)]^2]

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

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

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

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

It's late -- someone else do 1-3

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