Q35
0. When x=1/9 and y =-3/4, then the value of 94 the expression 81x2 + 16y2 - 72xy is
- Option : C
- Explanation : x = 1/9; and y = -1/4 (given)
81x2 + 16y2 - 72xy = (9x - 4y)2
= (9x(1/9) - 4x(-3/4))2
(on outputting value of x and y in the equation)
=(1 + 3)2 = 42 = 16
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