(x+y)²,x²-xy-2y²

Find third proportion
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1 Answer

Let The third proportional of a and b is p such that:
a/b = b/p
a=(x+y)²
b=x²-xy-2y²
(x+y)²/(x²-xy-2y²)=(x²-xy-2y²)/p
p(x+y)²=(x^2-xy-2y^2)^2
p=(x^2-xy-2y^2)^2/(x+y)²

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