Question 328472
Find the product or quotient:
:
{{{(35a + 280)/(a^2 - 64)}}}
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{{{(7a - 35)/(a^2-a-20)}}}
:
each expression can be factored here
{{{(35(a + 8))/((a-8)(a+8))}}}
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{{{(7(a - 5))/(a-5)(a+4))}}}
:
we can cancel some of this immediately, cancel  (a+8) and (a-5)
{{{(35)/((a-8))}}}
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{{{(7)/((a+4))}}}
:
Invert the dividing fraction and multiply
{{{(35)/((a-8))}}} * {{{(a+4)/7}}}
:
Cancel 7 into 35
{{{(5)/((a-8))}}} * (a+4) = {{{(5(a+4))/((a-8))}}} or {{{(5a+20)/((a-8))}}}