Question 134824
(x^2-2x-15)/(x^2+x-6) * (x^2-4x-21)/(x^2-25)

factor where you can:)

= [(x-5)(x+3)/(x+3)(x-2)] * [(x-7)(x+3)/(x-5)(x+5)]

Cancel (x+3) which are common to a numerator and a denominator:

= [(x-5)/(x-2)] * [(x-7)(x+3)/(x-5)(x+5)]

Cancel (x-5) which are common to a numerator and a denominator:

= [1/(x-2)] * [(x-7)(x+3)/(x+5)]

= [(x-7)(x+3)]/[(x-2)(x+5)]

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Cheers,
Stan H.