Math

posted by Lesedi

Please help Factorise fully 1. X^2-5x-14 2. Ab^2+3b 3. A^3-8a^2+15a

  1. Damon

    14 = 7*2 always :)

    (x-7)(x+2)

    ------------------
    b(Ab+3)
    -----------------
    suspect you mean
    a^3-8a^2+15a
    which is
    a (a^2-8a+15)
    but we know 15 = 3 * 5 and 3+5=8 :)
    so
    a (a-5)(a-3)

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