# How do you solve y = x^2 + 2x - 4?

Mar 3, 2017

I guess you want to factor, you just have to apply the quadratic formula.

#### Explanation:

$x = \frac{- b \pm \sqrt{{b}^{2} - 4 \left(a c\right)}}{2 a}$

$x = \frac{- 2 \pm \sqrt{{2}^{2} - 4 \left(1 \cdot - 4\right)}}{2 \cdot 1}$

$x = \frac{- 2 \pm \sqrt{4 - 4 \left(- 4\right)}}{2}$

$x = \frac{- 2 \pm \sqrt{4 + 16}}{2}$

$x = \frac{- 2 \pm \sqrt{20}}{2}$

x =(-2-√20)/2=-1-√ 5 = -3.236

x =(-2+√20)/2=-1+√ 5 = 1.236