if 2x +3y =8 and xy=2 find the value of 4x square +9y square Share with your friends Share 1 Rohita answered this Hope this helps! If you have a doubt or if anything in the picture isn't clear, just ask. 2 View Full Answer Shamama Siddiqui answered this hope it helps u 1 Monish answered this Q. If 2x + 3y = 8 and xy = 2, then find the value of 4x2 + 9y2 S. 2x + 3y = 8 Squaring both the sides, we get => (2x + 3y)2 = (8)2 => (2x)2 + (3y)2 + (2*2x*3y) = 64 [(a + b)2 = a2 + 2ab + b2] => 4x2 + 9y2 + 12xy = 64 => 4x2 + 9y2 = 64 - 12xy Since xy = 2, => 4x2 + 9y2 = 64 - 12(2) => 4x2 + 9y2 = 64 - 24 = 40 Thus, 4x2 + 9y2 = 40 1
