simplifying radicals

cuberoot (-162) = - cuberoot (27 * 6) = - cuberoot (3^3 * 6) = -3 * cuberoot(6)

cuberoot (16xy) = cuberoot (8*2xy) = cuberoot (2^3 *2xy) = 2 * cuberoot (2xy)

cube root of -162:
negative 5.4513617785
didn't find the other one