Since you cannot take the square root of a negative number, you might use which of the following instructions to find the square root of the variable x?
A) Math.sqrt(x*x);
B) Math.sqrt((int) x);
C) Math.sqrt(Math.abs(x));
D) Math.abs(Math.sqrt(x));
E) Math.sqrt(-x);

Question

Quizplus · Accepted Answer

C) Math.abs returns the absolute value of x. If x is negative, Math.sqrt(x) causes a run-time error, but Math.sqrt(Math.abs(x)) does not since x is first converted to its positive equivalent before the square root is performed. Answer A returns x (square root of x² is x). In answer B, casting x to an int will not resolve the problem if x is negative. In answer D, the two Math functions are performed in opposite order and so if x is negative, it still generates a run-time error. Answer E only will work if x is not positive and so if x is positive, it now generates a run-time error.

Since You Cannot Take the Square Root of a Negative