13
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x = 8
3 - 8 + 12 = x -5 + 12 = x 7 = x Answer : 7
2x + 5 = 13 2x = 8 2x/2 = 8/2 x=4
9 plus 7 equals 144. Generally, x plus y = x(x+y).
2 squared plus 2 x 3 = 10, 7 squared plus 7 x 2 = 63, 6 squared plus 6 x 5 = 66,8 squared plus 8 x 4 = 96 so 9 squared plus 9 x 7 = 81 + 63 = 144.