4 K Suppose f(x)dx = - 7, f(x)dx =7, and g(x)dx =3. Evaluate the following integrals. 2 2 g(x)dx = - 3 7 (Simplify your answer.) 3g(x)dx = 8 2 (Simplify your answer.)K Use the substitution u = x + 3 to evaluate the indefinite integral below. |2x ( x 2 + 3) 6 dx Write the integrand in terms of u. |2x (x2 +3)6 dx= duUse the substitution u = 3x- - 8 to find the following indefinite integral. Check your answer by differentiation. - - 6x sin (3x2 -8) dx - - 6x sin (3x2 -8) dx =Use a change of variables to find the indefinite integral. Check your work by differentiation. 1 dx 9- 16x2 dx = n 19 - 16x