g(b) Use the Substitution Formula, _ f(g(x)) . g'(x) dx = _ f(u) du where g(x) = u, to evaluate the a g(a) following integrals. a. J +3 (1 + 1 4 ) 3 dt b. 1 8 ( 1 + 1 4 ) 3 0 dt a . | +3 ( 1 + 1 4 ) 3 at = 0 (Simplify your answer.)