This is a sample question from my lesson.
f(x) = √(20 - 2x)
the lesson says the answer is x ≤ 10.
In my textbook it says "the expression under a radical may not be negative."
So, how do I change the sign and solve to get the answer above?

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You know that you can NOT take the square root of a NEGATIVE.
Correct?

yes, i know

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