You are Here: Home >< A-levels

# A Level maths students, can you help answer these two questions please?

Announcements Posted on
Would YOU be put off a uni with a high crime rate? First 50 to have their say get a £5 Amazon voucher! 27-10-2016
1. I'm really stuck on these two questions and would appreciate it very much if I could get some help.

1) Solve this algebraically:
x + y = 9
x^2 - 3xy + 2y^2 = 0

16x^4 - 4x^2 = 25

An explained answer would be amazing, as I want to learn the technique. Thank you very much!
2. (Original post by Student150)
I'm really stuck on these two questions and would appreciate it very much if I could get some help.

1) Solve this algebraically:
x + y = 9
x^2 - 3xy + 2y^2 = 0

16x^4 - 4x^2 = 25

An explained answer would be amazing, as I want to learn the technique. Thank you very much!
1. What different ways do you know to solve simultaneous equations? Which one seems most sensible to apply here?

2. What different ways can you solve a quadratic equation? Which one seems most sensible to apply here?
3. I'm not sure what stage of education you are at so i'll give you a chance to answer them anyway., However I will point you in the right direction.

1) This is a simulateaneous question. So you need to rearrange one of the equations and sub it into the other. That way you will get a value(s) for one letter and then sub your answer in again to get your answer for the other letter.

2) I hope you can appreciate this has a similar layout to a quadratic equation - it is a 'disguised quadratic'. I hope that helps.

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: August 28, 2016
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:
Today on TSR

Find out here

Poll

## All the essentials

### Student life: what to expect

What it's really like going to uni

### Essay expert

Learn to write like a pro with our ultimate essay guide.

### Create a study plan

Get your head around what you need to do and when with the study planner tool.

### Resources by subject

Everything from mind maps to class notes.

### Study tips from A* students

Students who got top grades in their A-levels share their secrets