Question

What are the exact solutions of x^2 − x − 4 = 0?

Answer 1

use the quadratic formula

Answer 2

\[x={-b \pm \sqrt{b^2-4ac}\over2a}\]

Answer 3

\[{-(-1) \pm \sqrt{(-1)^2-4\cdot1\cdot(-4)}\over 2\cdot1}={1\pm \sqrt{1+16}\over2}\]

Answer 4

\[={1 \pm \sqrt{17}\over2}\]

Answer 5

Thanks