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Question

Simplify:
$$x^2+4x-y^2+4y$$


Solution

Now,
$$x^2+4x-y^2+4y$$
$$=x^2-y^2+4(x+y)$$
$$=(x-y)(x+y)+4(x+y)$$
$$=(x+y)(x-y+4)$$.

Mathematics

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