math

Factorise completely:
1)3g-3t+2mg-2mt
2)3x squared + 2x-8
3)3x squared-27

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asked by mark
  1. 1. a "grouping" question

    3g-3t+2mg-2mt
    = 3(g-t) + 2m(g-t)
    You do the last step

    2. 3x^2 + 2x-8
    = (3x - 4)(? + ?) can you figure out the second bracket?

    3. 3x^2 - 27
    = 3(x^2 - 9)
    = ..... mmhh, looks like a difference of squares

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    posted by Reiny

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