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Question

Use suitable identities to find the product of
(x+5)(x+2)

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Solution

We need to find value of (x+5)(x+2)
We know identity (x+a)(x+b)=x2+(a+b)x+ab
Therefore, (x+5)(x+2)=x2+(5+2)x+5×2
=x2+7x+10

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