Solve Using the Quadratic Formula x^2+8=6x

$x^{2} + 8 = 6 x$

Step 1

Subtract $6 x$ from both sides of the equation.

$x^{2} + 8 - 6 x = 0$

Step 2

Use the quadratic formula to find the solutions.

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

Step 3

Substitute the values $a = 1$ , $b = - 6$ , and $c = 8$ into the quadratic formula and solve for $x$ .

$\frac{6 \pm \sqrt{{(- 6)}^{2} - 4 \cdot (1 \cdot 8)}}{2 \cdot 1}$

Step 4

Simplify.

Simplify the numerator.

Raise $- 6$ to the power of $2$ .

$x = \frac{6 \pm \sqrt{36 - 4 \cdot 1 \cdot 8}}{2 \cdot 1}$

Multiply $- 4 \cdot 1 \cdot 8$ .

Multiply $- 4$ by $1$ .

$x = \frac{6 \pm \sqrt{36 - 4 \cdot 8}}{2 \cdot 1}$

Multiply $- 4$ by $8$ .

$x = \frac{6 \pm \sqrt{36 - 32}}{2 \cdot 1}$

Subtract $32$ from $36$ .

$x = \frac{6 \pm \sqrt{4}}{2 \cdot 1}$

Rewrite $4$ as $2^{2}$ .

$x = \frac{6 \pm \sqrt{2^{2}}}{2 \cdot 1}$

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

$x = \frac{6 \pm 2}{2 \cdot 1}$

Multiply $2$ by $1$ .

$x = \frac{6 \pm 2}{2}$

Simplify $\frac{6 \pm 2}{2}$ .

$x = 3 \pm 1$

Step 5

The final answer is the combination of both solutions.

$x = 4, 2$