Question

How do you multiply `\frac { b ^ { 2} - b - 2} { b + 4} \cdot \frac { b + 4} { b ^ { 2} - 9b + 14}`?

Answer 1

Factorize denominator and numerator............

Explanation:

`(b^2-b-2)/cancel(b+4)xxcancel(b+4)/(b^2-9b+14)=(b^2-b-2)/(b^2-9b+14)`

`=[(b+1)cancel((b-2))]/[(b-7)cancel((b-2))]=(b+1)/(b-7)`

Anyway, don't trust my arithmetic............