Question

x² + 4x - 7 = 0

Solve, show work.

Answer 1

you have to use the quadratical general formula.

Answer 2

can you show me how?

Answer 3

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)