Question

find the value of (36 X square) + (49 y square) + (84 XY) (X=3 and Y=6)

Answer 1

$36( {3}^{2} ) + 49( {6}^{2} ) + 84(3 \times 6) = \\ 36(9) + 49(36) + 84(18) = \\ 324 + 1764 + 1512 = \\ 3684$
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Answer 2

36x^2+49y^2+84xy
(6x)^2+(7y)^2+2(6x)(7y)
(6x+7y)^2
(6*3+7*6)^2
(18+42)^2
60^2
3600