Question

49a^2-b^2                  a

-------------    .   --------------

4a^2                 63a-9b

 

4a

----------    . (ab-2b^2)

a^2 -4b^2 

 

 

7a

----------       .   (ab+5b^2)

a^2 - 25b^2

Answer 1

$frac{49a^2-b^2}{4a^2}*frac{a}{63a-9b} = frac{(7a-b)(7a+b)}{4a^2}*frac{a}{9(7a-b)} = frac{7a+b}{36a} \ \ frac{7a}{a^2-25b^2}*(ab+5b^2)=frac{7a}{(a-5b)(a+5b)}*b(a+5b)=frac{7ab}{a-5b}\ \ frac{4a}{a^2-4b^2}*(ab-2b^2)=frac{4a}{(a-2b)(a+2b)}*b(a-2b)=frac{4ab}{a+2b}$