Write the java expression to find the product of square root of P and the square root of Q using the methods of Math class.

Math.sqrt(P) * Math.sqrt(Q)

Math.sqrt() takes one argument and returns its square root as a double, so each root must be written as its own call and the two results multiplied with *. A neat alternative that also earns full marks is Math.sqrt(P * Q), since the square root of a product equals the product of the square roots. What loses marks is writing Math.sqrt(P, Q) — the method never takes two arguments.