112=8x2x7
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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.
9 plus 7 equals 144. Generally, x plus y = x(x+y).
x=15
x = -7
k = 2 7 + (5 x 2) = 17 (8 x 2) + 1 = 17