+0  
 
+1
30
4
avatar+250 

given that y= 2^x

express 4 interms of y

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

 
YEEEEEET  Oct 11, 2018
 #1
avatar+2403 
+2

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

 
Rom  Oct 11, 2018
 #2
avatar+250 
0

ye sorry about that

 
YEEEEEET  Oct 11, 2018
 #3
avatar+2403 
+2

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

 
Rom  Oct 11, 2018
 #4
avatar+250 
+1

oh.... thanks so much xd

 
YEEEEEET  Oct 11, 2018

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