Evaluate using the Fundamental Theorem of Calculus: $\int_{7}^{10} \frac{xdx}{\sqrt{x-6}}$
I am stuck with the x on top. I substitute $u = x-6$ and then $du = dx$. soo... $\int_{1}^{4} (u)^{-1/2}xdu$
is it okay to still have that x there or do I need to substitute something else? something maybe like... $x(x-6)^{-1/2}?$