You are Here: Home >< Maths

# Core 2 maths question watch

1. If ax^2 + bx + c = Lx^2 + mx + n , the values of the two quadratics are the same for all values of x. By applying this with x=0,x=-1 and x=1, deduce that a=1,b=m and c=n.
I figured out the answer for c=n by using x=0 but not sure for x=-1 and x=1.
2. (Original post by Chelsea12345)
If ax^2 + bx + c = Lx^2 + mx + n , the values of the two quadratics are the same for all values of x. By applying this with x=0,x=-1 and x=1, deduce that a=1,b=m and c=n.
I figured out the answer for c=n by using x=0 but not sure for x=-1 and x=1.
Strange question. There are easier ways to see that a = L, b = m and c = n.

Anyway, once you substitute x=1 and x=-1 into both sides you should end up with two equations. Try adding the equations together and see what happens. Please post your working if you get stuck.

(I'm assuming you meant a = L instead of a = 1).

### Related university courses

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: January 25, 2017
Today on TSR

### Edexcel C2 Core Unofficial Markscheme!

Find out how you've done here

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