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Question

If f(x)=2x+2x2, find f(x+y),f(xy).

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Solution

Given, f(x)=2x+2x2
Thus f(x+y)=2x+y+2(x+y)2
f(x+y)=2x+y+2xy2
And f(xy)=2xy+2(xy)2
f(xy)=2xy+2yx2

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