You are Here: Home >< Maths

# edexcel maths question 9-1 what is wrong with the answer?? watch

1. express 2x^2+20x+7 in the form 2(x+p)^2 +q

I wrote 2(x+10)^2 +107

I know something is missing but I don't know since I'm self learning this
2. Factor out a 2 of the first 2 terms then complete the square on the terms inside the bracket
3. Firstly, when you complete the square, when you square the integer inside the bracket, it always becomes negative when it goes outside the brackets.
Secondly, when you have something like the "2" in front of the brackets, when you have square the integer inside the brackets, you also have to multiply it by this number
4. (Original post by -Phoenix-)
Firstly, when you complete the square, when you square the integer inside the bracket, it always becomes negative when it goes outside the brackets.
Secondly, when you have something like the "2" in front of the brackets, when you have square the integer inside the brackets, you also have to multiply it by this number
thank you, i applied it your solution and got the asnwer 2(x+5)^2-43 which is correct
5. (Original post by TUGBA_AYDIN1)
thank you, i applied it your solution and got the asnwer 2(x+5)^2-43 which is correct
Worked Solution
Attached Images

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: May 20, 2017
Today on TSR

### Congratulations to Harry and Meghan!

But did you bother to watch?

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