Solve Using the Quadratic Formula 2x^2-16x+50=0

$2 x^{2} - 16 x + 50 = 0$

Step 1

Use the quadratic formula to find the solutions.

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

Step 2

Substitute the values $a = 2$ , $b = - 16$ , and $c = 50$ into the quadratic formula and solve for $x$ .

$\frac{16 \pm \sqrt{{(- 16)}^{2} - 4 \cdot (2 \cdot 50)}}{2 \cdot 2}$

Step 3

Simplify.

Simplify the numerator.

Raise $- 16$ to the power of $2$ .

$x = \frac{16 \pm \sqrt{256 - 4 \cdot 2 \cdot 50}}{2 \cdot 2}$

Multiply $- 4 \cdot 2 \cdot 50$ .

Multiply $- 4$ by $2$ .

$x = \frac{16 \pm \sqrt{256 - 8 \cdot 50}}{2 \cdot 2}$

Multiply $- 8$ by $50$ .

$x = \frac{16 \pm \sqrt{256 - 400}}{2 \cdot 2}$

Subtract $400$ from $256$ .

$x = \frac{16 \pm \sqrt{- 144}}{2 \cdot 2}$

Rewrite $- 144$ as $- 1 (144)$ .

$x = \frac{16 \pm \sqrt{- 1 \cdot 144}}{2 \cdot 2}$

Rewrite $\sqrt{- 1 (144)}$ as $\sqrt{- 1} \cdot \sqrt{144}$ .

$x = \frac{16 \pm \sqrt{- 1} \cdot \sqrt{144}}{2 \cdot 2}$

Rewrite $\sqrt{- 1}$ as $i$ .

$x = \frac{16 \pm i \cdot \sqrt{144}}{2 \cdot 2}$

Rewrite $144$ as $12^{2}$ .

$x = \frac{16 \pm i \cdot \sqrt{12^{2}}}{2 \cdot 2}$

Pull terms out from under the radical, assuming positive real numbers.

$x = \frac{16 \pm i \cdot 12}{2 \cdot 2}$

Move $12$ to the left of $i$ .

$x = \frac{16 \pm 12 i}{2 \cdot 2}$

Multiply $2$ by $2$ .

$x = \frac{16 \pm 12 i}{4}$

Simplify $\frac{16 \pm 12 i}{4}$ .

$x = 4 \pm 3 i$