SOLUTION If we look at the section of table titled Forms involving a2 − u2, we see that the closest entry is number 34.u2a2 − u2 du = − u2a2 − u2 + a22 sin−1ua + CThis is not exactly what we have, but we will be able to use it if we first make the substitution u = 2x.x25 − 4x2 dx