Question

Which value of x is in the domain of f(x) = x - 7? A. X = 8 B. x = -3 C. x = 0 D. x = 6

Answer 1

the value inside the square root must be positive or zero, then:

x - 7 ≥ 0

x - 7 +7 ≥ 0 + 7 adding 7 at both sides

x ≥ 7

The only option greater than or equal to 7 is 8