1. ## Rearranging a polynomial

Hi,

I'm stuck trying to rearrange a simple equation to make x the subject. Any help would be greatly appreciated....

y = 1211.1x2 - 7476x + 9139.7

Cheers...

2. Originally Posted by frankspencer
Hi,

I'm stuck trying to rearrange a simple equation to make x the subject. Any help would be greatly appreciated....

y = 1211.1x2 - 7476x + 9139.7

Cheers...
if $y = ax^2 + bx + c$ , then ...

$x = \frac{-b \pm \sqrt{b^2-4ac}}{2a}$

3. ## No y?

But where did the y go?

4. Originally Posted by frankspencer
But where did the y go?

Skeeter's answer was for when $y= 0$

Another way would be to complete the square. Will be very messy.