7
6
5
4
Correct answer is D
23x + 101x = 130x 2 x X1 + 3 x Xo + 1 x X2 + 0 x X1 + 1 x Xo = 1 x Xo = 1 x X2 + 3 x X1 + 0 x Xo = X2 + 3x + 0 2x + 3 = x2 + 0 + 1 + x2 + 3x 2x - 3x + x2 - x2 = -3 - 1 - x = -4 x = 4
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