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...
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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 $\displaystyle y = ax^2 + bx + c$ , then ... $\displaystyle x = \frac{-b \pm \sqrt{b^2-4ac}}{2a}$
But where did the y go?
Originally Posted by frankspencer But where did the y go? Skeeter's answer was for when $\displaystyle y= 0 $ Another way would be to complete the square. Will be very messy.
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