You are Here: Home >< GCSEs

1. please can someone help me with these!
1) e^2-36
2) n^2 + 4n - 12
3) s^2 - 64
4) 4a + 4a - 3
5) 49v^2 - 64
6) 9m^2 - 12m + 4
2. (Original post by anneysmithey)
please can someone help me with these!
1) e^2-36
2) n^2 + 4n - 12
3) s^2 - 64
4) 4a + 4a - 3
5) 49v^2 - 64
6) 9m^2 - 12m + 4
1 - Difference of 2 squares
2 - Grid method or you could complete the square
3 - Difference of 2 squares
5 - Difference of 2 squares
6 - Complete the square or grid method

3. (Original post by CheeseIsVeg)
1 - Difference of 2 squares
2 - Grid method or you could complete the square
3 - Difference of 2 squares
5 - Difference of 2 squares
6 - Complete the square or grid method

There's also the ac method for quadratics where a > 1
4. My school taught us a neat method called the AM method for regular quadratics.
1st example (when a = 1):

x2 + 7x + 12 = 0

You ask yourself, "what adds to 7 and then multiplies to 12?"

This leads to getting +4 and +3...

This goes to (x+3) (x+4)

2nd example (when a doesn't equal 1):
2x2 + 9x + 10 = 0

Ok for this one multiply the c term by the a term to get +20. Ask yourself "What multiplies to 20 and adds to 9?
Now replace the bx term with your answers: 2x2 + 4x + 5x +10
Factorise the left half: 2x(x+2) what is inside the bracket will always be the same for the right half
Factorise the right half: 5(x+2)
So your solutions are (2x+5) and (x+2) (if you can't remember what the other solution is, underline the stuff outside the bracket to help you remember.

This method is quick once you get the hang of it but only works for these types of quadratics

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 24, 2016
Today on TSR

### Congratulations to Harry and Meghan!

But did you bother to watch?

Poll
Useful resources

## Study tools

### Essay expert

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

See where you can apply with our uni match tool

### Make study resources

Create all the resources you need to get the grades.

### Create your own Study Plan

Organise all your homework and exams so you never miss another deadline.

### Resources by subject

From flashcards to mind maps; there's everything you need for all of your GCSE subjects.

### Find past papers

100s of GCSE past papers for all your subjects at your fingertips.