Let f(x) = 9x3 + 21x2 − 14 and g(x) = 3x + 1. Find f of x over g of x. 3 times x squared plus 6 times x minus 2 minus 12 over the quantity 3 times x plus 1 3 times x squared plus 6 times x minus 2 plus 12 over the quantity 3 times x plus 1 3 times x squared plus 6 times x plus 2 minus 12 over the quantity 3 times x plus 1 3 times x squared plus 6 times x plus 2 plus 12 over the quantity 3 times x plus 1