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Question 13

Square of  3x4y is
a) 9x216y2
b) 6x28y2
c) 9x2+16y2+24xy
d)  9x2+16y224xy

 


Solution

d)  9x2+16y224xy

Square of (3x4y) will be (3x4y)2.

​​​​​​​Now, using the identity (ab)2=a22ab+b2

(3x4y)2=(3x)22.3x.4y+(4y)2=9x224xy+16y2

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