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Question

Question 16

a2b2 is equal to
a) (ab)2
b) (ab)(ab)
c) (a+b)(ab)
d) (a+b)(a+b)

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Solution

c) (a+b)(ab)

a) (ab)2=a22ab+b2
b) (ab)(ab)=(ab)2=a22ab+b2
c) (a+b)(ab)=a(ab)+b(ab)
=a2ab+bab2=a2b2 [ab=ba]
d) (a+b)(a+b)=(a+b)2=a2+2ab+b2

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