Question

solve x^2 -20=0 with the quadratic formula.... didnt even know this was possible... help!

Answer 1

ok... the general form of a quadratic is

\[ax^2 + bx + c= 0\]

the general quadratic formula is

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

in your question a = 1, b = 0 and c = -20

substitute them and evaluate for an answer... you make have to leave it in radical form.