Question

What is the domain of the function?
y = √5x - 10
(The square root symbol extends over the "5x - 10")
a.) x >= -2
b.) x <= -2
c.) x >= 2
d.) x <= 2

Thank you! :)

Answer 1

Hey! Since you can't have a negative number under the radical(Not unless you use imaginary numbers), you can simply solve for the equation 0 <= 5x-10
10<= 5x
2<= x
The answer is C! X has to be greater than or equal to 2 in order to get an answer for Y.