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Question

Expand (x+3)(x3)

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Solution

Using the identity is (x+y)(xy)=x2y2.

GIven: (x+3)(x3), we apply the above identity by taking a=3 and b=43
We get, (x+3)(x3)=(x)2(3)2=x29

Hence, (x+3)(x3)=x29.

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