# Maths AS June 2015 C1 pp (edexcel)Watch

#1
one of the questions says that, given that 2^x=y
express 4^x in terms of y
in the ms it says that the answer is y^2 but I don't understand how to get there
0
2 years ago
#2
(Original post by ria1099)
one of the questions says that, given that 2^x=y
express 4^x in terms of y
in the ms it says that the answer is y^2 but I don't understand how to get there
You know that 4 = 2^2
So 4^x can be written as (2^2)^x
So then you just multiply out the powers to get 2^2x
Which is the same as (2^x)^2, so if y=2^x, 4^x = y^2
0
#3
(Original post by KaylaB)
You know that 4 = 2^2
So 4^x can be written as (2^2)^x
So then you just multiply out the powers to get 2^2x
Which is the same as (2^x)^2, so if y=2^x, 4^x = y^2
ahh thank you, I completely forgot about doing it that way!!
0
2 years ago
#4
(Original post by ria1099)
ahh thank you, I completely forgot about doing it that way!!
No problem
0
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