Question 420234
{{{((y^2-16)/(y^2+y-2)) *(( y^2+6y-7)/(y^2+9y+20))}}}


{{{(((y+4)(y-4))/((y+2)(y-1)))*(((y+7)(y-1))/((y+4)(y+5)))}}}

{{{((y-4)(y+7))/((y+2)(y+5))}}}