given that y= 2^x

express 4 interms of y

the answer is y^2 but i have no idea why do please explain

\(\text{what you've written isn't correct on it's own}\\ y=2^x \Rightarrow y^2 = (2^x)^2 = 2^{2x} = 4^x \\ \text{did you mean to write express }4^x \text{ in terms of }y?\)

ye sorry about that

\(4^x = (2^2)^x = 2^{2x} = (2^x)^2 = y^2\)

oh.... thanks so much xd