Determine the set of values of x for which the radical expression would produce a real number. Answer in interval notation. Square root of 15-x

Question

/——

15-x     (That’s supposed to be a radical.)

Answer 1

√(15-x)

To produce a real number the radicand must be ≥ 0

 

15-x ≥ 0

-x ≥ -15

x ≤ 15

 

In interval notation:  (-∞, 15]