Question

2 Expand (a+b) (a-b)​

Answer 1

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Given:

(a+b)(a-b)

It can also be written as:

(a+b)×(a-b)

=>(a×a)+(a×-b)+(b×a)+(b×-b)

=>a^2+(-ab)+(ab)+(-b^2)

=>a^2+(-b^2)

=>a^2-b^2

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