## anonymous 5 years ago x² + 4x - 7 = 0 Solve, show work.

1. anonymous

you have to use the quadratical general formula.

2. anonymous

can you show me how?

3. anonymous

Ok general formula for quadratic equations is the following: $x=(b^{2}\pm \sqrt{b^{2}}-4ac)/2a$ The big mistery here is what a, b and c means, right? If you look the coefficient of x^2, you can see it is 1. The same for the coefficient of x that is equal to 4. You can realize that c is equal to -7. Now replace in the formula above each value and you will find the answer (values for x)