Type the correct answer in each box. Use numerals instead of words. multiply the expressions

(3x^2 +2x-21)/(-2x^2 -2x+12) • (2x^2 + 25x+63)/(6x^2 +7x-49)

if a =1, find the values of B, C, and D that make the given expression equivalent to the expression below

(ax+b)/(cx+d)

b= _, c=_, and d=___