Which integral is equivalent to ∫xx−1dx\int x\sqrt{x-1} dx∫xx−1dx using u=x−1u = x-1u=x−1?
∫(u+1)udu\int (u+1)\sqrt{u} du∫(u+1)udu
∫uudu\int u\sqrt{u} du∫uudu
∫(u−1)udu\int (u-1)\sqrt{u} du∫(u−1)udu
∫udu\int \sqrt{u} du∫udu