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# Maths - Factorising Watch

1. 2x^ +5x -3 = 0

The answer says that it is (2x-1) (x+3). Howww??? What two numbers multiply to -3 and add to +5. Help plsss
2. (Original post by Perfection Ace)
2x^ +5x -3 = 0

The answer says that it is (2x-1) (x+3). Howww??? What two numbers multiply to -3 and add to +5. Help plsss
There's a difference between and .
3. (Original post by Perfection Ace)
2x^ +5x -3 = 0

The answer says that it is (2x-1) (x+3). Howww??? What two numbers multiply to -3 and add to +5. Help plsss
(Original post by Zacken)
There's a difference between and .
aww 1 minute too late :/ i'm getting slow
4. (Original post by Zacken)
There's a difference between and .
Okay, so the difference is there's a number for the x^2? What happens then?
5. so for any quadratic equation ax^2 + bx + c

the numbers that go in the brackets must add to b, and multiply to give ac.

so when a=1
its just 2 numbers that multiply to give c
but when a=2 for example its numbers that multiply to give ac which will be 2 x c

have a watch of this for a more detailed explanation
6. (Original post by gozzabomb)
so for any quadratic equation ax^2 + bx + c

the numbers that go in the brackets must add to b, and multiply to give ac.

so when a=1
its just 2 numbers that multiply to give c
but when a=2 for example its numbers that multiply to give ac which will be 2 x c

have a watch of this for a more detailed explanation
Ayeeee, damn, thanks a lot bro! I get it now! Thanks!

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