12x11 + 2x x12 ++2 dx Step 1 Notice that the numerator is the derivative of the denominator. Thus the integral is of the form Formula for integrals. dx. Use the Logarithmic Sdx = 10 du = Inu] + C Let u = x12 + x and du = (12x11 + 2x)dx dx. Substitute these values to write the integral in terms of X u and du. 12x11 + 2x 12+x dx = In(x12+x)+c