You are Here: Home >< Maths

Announcements Posted on
Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
1. I was refreshing my knowledge of GCSE Maths by factorising quadractics. I did 6 problems and then checked if my answers are right. I only got the last 5 problems right. I can't work my head around to getting the answer of the first problem (sad I know ).

The problem is: 3x^2+5x+2.

My 2 embarrassing attempts:
Spoiler:
Show
2. When factoring , you need to find two numbers whose sum equals and whose product equals .
In your attempts, you found the numbers , but their product does not equal .
3. It's a pain thinking of numbers to put in the brackets; I find it much easier to just complete the square or even use the quadratic formula.

You'll get

Giving you or
4. The answer to that problem is: (3x+2) (x+1)

I don't get how I got the other 5 right, when I followed the same method (used on MathsWatch, since my teacher wasn't helpful). I'll show you how I did one other problem and got it right.

5. (Original post by 34908seikj)
It's a pain thinking of numbers to put in the brackets; I find it much easier to just complete the square or even use the quadratic formula.

Giving you
And this is why simply using the formula without thought goes wrong. This is incorrect.
6. I just worked it backwards with the answer and see where I went wrong. Apparently, I should have used 2 and 3, instead of 6 and -1.

Since 6 times -1 equals -6, when multiplying the coefficient of x^2 which is 3 times the constant of 2 equals 6...

Rookie mistake by me.
7. (Original post by 34908seikj)
It's a pain thinking of numbers to put in the brackets; I find it much easier to just complete the square or even use the quadratic formula.

You'll get

Giving you or
Erm multiply those 2 expressions together and see what you get...
8. (Original post by ColossalAtom)
The answer to that problem is: (3x+2) (x+1)

I don't get how I got the other 5 right, when I followed the same method (used on MathsWatch, since my teacher wasn't helpful). I'll show you how I did one other problem and got it right.

Awesome handwriting
9. (Original post by Helg)
Awesome handwriting
I have to take high dosage of immunosuppressants, so having tremors is to be expected.
10. (Original post by ColossalAtom)
I have to take high dosage of immunosuppressants, so having tremors is to be expected.
Oh didn't know that, my cousin has the same. I personally have dyslexia which is a big obstacle for math [especially with algorithms] so I was allowed extra time in exams.
11. (Original post by ColossalAtom)
I was refreshing my knowledge of GCSE Maths by factorising quadractics. I did 6 problems and then checked if my answers are right. I only got the last 5 problems right. I can't work my head around to getting the answer of the first problem (sad I know ).

The problem is: 3x^2+5x+2.

My 2 embarrassing attempts:
I just use my calculator's quadratic solver and then turn them into the factorised form because I'm too lazy to solve them by hand :^)
12. (Original post by 34908seikj)
It's a pain thinking of numbers to put in the brackets; I find it much easier to just complete the square or even use the quadratic formula.

You'll get

Giving you or
nah.

## 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 2, 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

### University open days

Is it worth going? Find out here

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read here first

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams