What is answer of Q 15
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given a/b=b/c
so, a*c=b^2
lhs =>(a+b+c)(a-b+c)
=>[(a+c)+b][(a+c)-b]
=>(a+c)^2-b^2
=>a^2+c^2+2*a*c-b^2
=>a^2+c^2+2*b^2-b^2
=>a^2+b^2+c^2
=>rhs
hence it is proved.
so, a*c=b^2
lhs =>(a+b+c)(a-b+c)
=>[(a+c)+b][(a+c)-b]
=>(a+c)^2-b^2
=>a^2+c^2+2*a*c-b^2
=>a^2+c^2+2*b^2-b^2
=>a^2+b^2+c^2
=>rhs
hence it is proved.
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