Let the function f be defined by f(x) = √2x. If f(c) = 4, what is the value of c? Can someone explain why...

Can someone explain why the answer to this problem is 8?

Let the function f be defined by f(x) = √2x. If f(c) = 4, what is the value of c? Can someone explain why...
f(x) = √(2x)





Therefore, f(c) = √(2c)





But f(c) = 4,





so, √(2c) = 4





Square both sides :


2c = 16





Divide both sides by 2 :


c = 8
Reply:the value of C= 8 because if you evaluate the fuction as f(8)=√2(8) its equal to √16 which is 4