Question

identities

(x+a)(x+b)=x2 +x(a+b)+ab
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Answer 1

(x+y)²=x²+y²+2xy

(x-y)²=x²+y²-2xy

(x²-y²)=(x+y)(x-y)

There are many more identities..

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Answer 2

Please Refer To The Attachment

Hope This Helps You