How do you multiply and simplify \frac { a + 9} { a ^ { 2} + 2a - 63} \cdot \frac { a - 7} { 8}a+9a2+2a63a78?

1 Answer
May 29, 2018

1/818

Explanation:

factorise teh denominator

(a+9)/(a^2+2a-63)*(a-7)/8a+9a2+2a63a78

=(a+9)/((a+9)cancel((a-7)))*cancel((a-7))/8

=cancel(a+9)/cancel(a+9)*1/8

=1/8