Question

Do not evaluate the integral, identify u=g(x) and du = g'(x)dx

Answer 1

\[\int\limits_{}^{}f(g(x))g'(x)=\int\limits_{}^{}(x ^{2}\sqrt{x ^{3}+1})dx\]

Answer 2

\[u= x^3+1 \\
du = 3 x^2 dx \\
\frac {du}3 = x^2 dx

\]

Answer 3

ty, i dont think i needed the third one tho, i think.