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# Quadratic Equations watch

1. Evil maths strikes back at me! I absolutely hate maths although I can do most of it, but sometimes, I get problems and this is one...

So here is my problem, I'm just a bit confused. Teacher says set equation to 0 (already is,) factorise - well I get confused because there's like 3 ways to factorise and then solve.

(2x+5) (3x-2) = 0

Now it's probaly not very hard but I'm very confused with all the factorising. I don't know whether to cancel out (6x^2 etc etc) or solve it.

Thanks for your help.
2. (Original post by gemgems89)
Evil maths strikes back at me! I absolutely hate maths although I can do most of it, but sometimes, I get problems and this is one...

So here is my problem, I'm just a bit confused. Teacher says set equation to 0 (already is,) factorise - well I get confused because there's like 3 ways to factorise and then solve.

(2x+5) (3x-2) = 0

Now it's probaly not very hard but I'm very confused with all the factorising. I don't know whether to cancel out (6x^2 etc etc) or solve it.

Thanks for your help.

What is it you're trying to do? Solve it?
3. There are 2 solutions to the equation:

2x+5 = 0 or 3x-2 = 0

<=> x = -5/2 or x = 2/3

Hope this helps.
4. (Original post by MadNatSci)
What is it you're trying to do? Solve it?
isn't it already solved?
5. (Original post by gemgems89)
Evil maths strikes back at me! I absolutely hate maths although I can do most of it, but sometimes, I get problems and this is one...

So here is my problem, I'm just a bit confused. Teacher says set equation to 0 (already is,) factorise - well I get confused because there's like 3 ways to factorise and then solve.

(2x+5) (3x-2) = 0

Now it's probaly not very hard but I'm very confused with all the factorising. I don't know whether to cancel out (6x^2 etc etc) or solve it.

Thanks for your help.

Hi this is what i got, check it with someone just in case im not right, but i think i am

1. (2x+5) (3x-2)=0
2. 6x^2-4x+15x=10
3. 6x^2+12x=10
4. factorise 6x(x+2)=10
6. Hey,

The way to solve this is like your teacher says, set the equation to zero.

(2x+5) (3x-2) = 0

Having done this, you know that either (2x+5) = 0, or (3x-2)=0, as there are two factors in the equation, so if one of them is zero, it doesn't matter what the other one is, the product will be zero too.

If 2x+5 = 0, then:

2x = -5

so: x = -5/2

Alternatively, if: 3x-2 = 0,

then: 3x = 2,

x = 2/3

So the two possible values for x are -5/2 and/or 2/3.

Hope this helps

G
7. (Original post by gzftan)
Hey,

The way to solve this is like your teacher says, set the equation to zero.

(2x+5) (3x-2) = 0

Having done this, you know that either (2x+5) = 0, or (3x-2)=0, as there are two factors in the equation, so if one of them is zero, it doesn't matter what the other one is, the product will be zero too.

If 2x+5 = 0, then:

2x = -5

so: x = -5/2

Alternatively, if: 3x-2 = 0,

then: 3x = 2,

x = 2/3

So the two possible values for x are -5/2 and/or 2/3.

Hope this helps

G
Yes, thanks everyone. I just never know how to factorise which bit. Still a bit confused but the answer makes sense.
8. (Original post by gzftan)
Hey,

The way to solve this is like your teacher says, set the equation to zero.

(2x+5) (3x-2) = 0

Having done this, you know that either (2x+5) = 0, or (3x-2)=0, as there are two factors in the equation, so if one of them is zero, it doesn't matter what the other one is, the product will be zero too.

If 2x+5 = 0, then:

2x = -5

so: x = -5/2

Alternatively, if: 3x-2 = 0,

then: 3x = 2,

x = 2/3

So the two possible values for x are -5/2 and/or 2/3.

Hope this helps

G
isn't my way right???
9. (Original post by Babygal)
Hi this is what i got, check it with someone just in case im not right, but i think i am

1. (2x+5) (3x-2)=0
2. 6x^2-4x+15x=10
3. 6x^2+12x=10
4. factorise 6x(x+2)=10
you can't solve 6x(x+2)=10 direcly.
10. (Original post by Babygal)
isn't my way right???
not really.
11. (Original post by elpaw)
not really.
So what is the right way? Now I am confused!
12. (Original post by elpaw)
not really.

lol true, my math needs sortin
13. Dont worry about the good old quadratic equations.
It soon becomes clear.
And unless you do engineering, you neva need them again.

Free Spirit
14. (Original post by gemgems89)
So what is the right way? Now I am confused!
the way gztfan did it.

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