##
Important Formula:-

(a + b)^{2} = a^{2}
+ 2ab + b^{2}
(a - b)^{2} = a^{2} - 2ab + b^{2}
(a + b) (a - b) = (a^{2}
- b^{2})

^{2}= a

^{2}+ 2ab + b

^{2}

^{2}= a

^{2}- 2ab + b

^{2}

^{2}- b

^{2})

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