Let f(x) = 2x, g(x) = 2x^2 – x, and h(x) = 3x. Lola finds the composition [f o g o h](x) as shown below. What error did Lola make?
= 2[2(3x)^2 – 3x]
= 2[2(9x^2) – 3x]
= 2(18x^2 – 3x)
= 36x^2 – 3x