Q9 of 95 Page 93

Find the value of the expression (64x2 + 81y2 + 144xy), when x = 11 and .

Given,


(64x2 + 81y2 + 144xy)


X = 11


Y =


By using the formula (a + b)2 we get;


= (8x)2 + (9y)2 + 2(8x)(9y)


= (8x + 9y)2


= [8(11) + 9 ]2


= (88 + 12)2


= (100)2 = 10000


Hence the value of the expression is 10000.


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