# Thread: Simplifing to get the 2 values of x

1. ## Simplifing to get the 2 values of x

Hi,

Sorry it's been ages since I've tried to do this, I have the following that I would like some help getting to x =

$\displaystyle 4x^2-500x-900000=-3x^2$

I don't thing that the answer is a whole number, I'm not too concerned about the anwser just the steps to getting there.

Any help would be great thanks.

2. Originally Posted by FRANTICSTAR
Hi,

Sorry it's been ages since I've tried to do this, I have the following that I would like some help getting to x =

$\displaystyle 4x^2-500x-900000=-3x^2$

I don't thing that the answer is a whole number, I'm not too concerned about the anwser just the steps to getting there.

Any help would be great thanks.
?? If you want to solve,
$\displaystyle 4x^2-500x-900000=-3x^2$

You should realise that not only is the answer not going to be a whole number it will be imaginary also as it would change to:

$\displaystyle 7x^2-500x-900000= 0$

3. I didn't think that you could add $\displaystyle 4x^2$ with $\displaystyle 3x^2$ like : $\displaystyle 7x^2 = 3x^2 + 4x^2$

If for example x=1 $\displaystyle 7^2$ wouldn't equal $\displaystyle 3^2 + 4^2$

4. Originally Posted by FRANTICSTAR
I didn't think that you could add $\displaystyle 4x^2$ with $\displaystyle 3x^2$ like : $\displaystyle 7x^2 = 3x^2 + 4x^2$

If for example x=1 $\displaystyle 7^2$ wouldn't equal $\displaystyle 3^2 + 4^2$
If $\displaystyle x=1$ then $\displaystyle 7\cdot(1)^2=3\cdot(1)^2 + 4\cdot(1)^2$

To make things easiers, think in $\displaystyle x^2$ as for example $\displaystyle A$. So $\displaystyle 7 \cdot A=3 \cdot A+4 \cdot A$

5. As already mentioned be careful when you substitiute numbers in remember BODMAS or PEDMAS as it is now called, you have to do calculations in a particular order, before you multiply you have to raise to the power first if that makes sense.

eg when x=1 $\displaystyle 7x^2 = 7*1^2 = 7*1 = 7$