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Kenny24 · Jul 26, 2007, 08:50 AM

what is x equals - b plus or minus radical b squared plus 4 times a times c all above 2 times a.

galactus · Jul 26, 2007, 09:05 AM

That's the quadratic formula. You use it to solve a quadratic. $ax^{2}+bx+c=0$

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

Suppose you have $x^{2}+3x-2=0$

You have a=1, b=3, c=-2. Plug them into the formula and find your solutions.

ebaines · Jul 26, 2007, 10:01 AM

There seems to be a typo in Kenny's posting - he has "plus times a times c," whereas the quadratic formula has minus 4ac. Either that or the equation his version solves is:

$<br /> ax^2 + bx - c = 0<br />$

galactus · Jul 26, 2007, 10:44 AM

Good catch, ebaines. I'm thinking, perhaps, it's a typo.

nicespringgirl · Jul 30, 2007, 07:14 PM

I think it is a typo of his, NO PERHAPS. ;)