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Question

Prove the following identities :

(i) (a+b)2=a2+b2+2ab

(ii) (ab)2=a2+b22ab [2 MARKS]

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Solution

Proof: 1 Mark each

(i) (a+b)2=(a+b)(a+b)

=a2+ab+ba+b2

=a2+ab+ab+b2[ab=ba]

=a2+b2+2ab

(a+b)2=a2+b2+2ab


(ii)(ab)2=(ab)(ab)

=a2baab+b2

=a2abab+b2[ab=ba]

=a2+b22ab

(ab)2=a2+b22ab


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