Please solve question 15.
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(a+b+c)(a-b+c)
(a²-ab+ca+ab-b²+bc+ac-cb+c²)
(a²-b²+c²+2ac)
(a²-b²+c²+ac+ac)
given a/b=b/c ; ac=b²
(a²-b²+c²+b²+b²)
(a²+b²+c²)
RHS
LHS = RHS
(a²-ab+ca+ab-b²+bc+ac-cb+c²)
(a²-b²+c²+2ac)
(a²-b²+c²+ac+ac)
given a/b=b/c ; ac=b²
(a²-b²+c²+b²+b²)
(a²+b²+c²)
RHS
LHS = RHS
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