Math

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Factor

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 -

    4. 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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