You are Here: Home >< Maths

# 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
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
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!!
4. (Original post by ria1099)
ahh thank you, I completely forgot about doing it that way!!
No problem

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: April 6, 2016
Today on TSR

### Is this person a genius?

...with these A Level results?

### I think I'm transgender AMA

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.