Evaluate each of the following using identities:

(i)


(ii) (2x+y) (2x-y)


(iii)


(iv) (a – 0.1) (a +0.1)


(v)

(i) We know, (a-b)2 = a2 + b2 -2ab


(ii) We know, (a-b)2 = (a+b) (a-b)


(2x+y) (2x-y) = (2x)2– y2 = 4x2 – y2


(iii) We know, (a-b)2 = a2 + b2 -2ab



(iv) We know, (a-b)2 = (a+b) (a-b)


(a – 0.1) (a +0.1) = (a)2– (0.1)2


= a2 – 0.01


(v) We know, (a-b)2 = a2 - b2



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