Which of the following integrals can be evaluated using substitution by letting u = x^2 + 1?

Calculate the definite integral.

${\int }_1^2\frac{10x^3}{\sqrt{x^2+2}}dx$

Evaluate the integral using trigonometric substitution: ${\int }_{10\sqrt{2}}^{20}\frac{1}{\sqrt{x^2-100}}dx$