Question

a2+b2/c2+d2=ab+ad-bc/bc+vd-ad
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Answer 1

Step-by-step explanation:

Thoughtfully split the expression at hand into groups, each group having two terms :

Group 1:  a2 + 4bc 

Group 2:  -4ad + 4bc 

Group 3:  -b2 - c2 

Pull out from each group separately :

Group 1:   (a2 + 4bc) • (1)

Group 2:   (ad - bc) • (-4)

Group 3:   (b2 + c2) • (-1)

Looking for common sub-expressions :

Group 1:   (a2 + 4bc) • (1)

Group 3:   (b2 + c2) • (-1)

Group 2:   (ad - bc) • (-4)