-7 x -2 = 14 14-1=13 13 is the answer.
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2 x 2 x 7 x 11 or 2^2 x 7^1 x 11^1
f(x) = 2x + 1 g(x) = x^2 - 7 So f*g(x) = f(g(x)) = f(x^2 - 7) = 2*(x^2 - 7) + 1 = 2*x^2 - 14 + 1 = 2*x^2 - 13
1 x 14, 2 x 7, 7 x 2, 14 x 1
10 + 2(x - 1) + 7 x 3x + 1 =10 + 2x - 2 + (7 x 3x) + 1 =10 + 2x - 2 + 21x + 1 =2x + 21x + 10 - 2 + 1 =23x + 9