Let the function f be defined as f(x) = root of 2x if f(c) = 4 what is the value of c?

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Let the function f be defined as f(x) = root of 2x if f(c) = 4 what is the value of c?
f(x) = SQRT(2x)


4 = SQRT(2c)


4^2 = [SQRT(2c)]^2


16 = 2c


c=8
Reply:f(x)= root of 2x


f(c)= root of 2c = 4


root of 2c = 4


2c = 4 square


2c = 16


c = 8