If 20 – √x = 11, then what are possible values of x?

-81, -9, 3, 9, 81

The correct answer is 81.

Let's solve the equation 20 – √x = 11 by combining and rearranging. We get 9 = √x. Squaring both sides results in 81 = x, and this is the only value that x can take on. Thus, only answer 81 will be correct. ---------- -9 squared is also 81 is it not?

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