Solve 8-2x^2=2

$$8 - 2 x ^ { 2 } = 2$$

Solve for x

$$x=\sqrt{3}\approx 1.732050808$$

$$x=-\sqrt{3}\approx -1.732050808$$

Steps by Finding Square Root

Subtract 8 from both sides.

$$-2x^{2}=2-8$$

Subtract 8 from 2 to get -6.

$$-2x^{2}=-6$$

Divide both sides by -2.

$$x^{2}=\frac{-6}{-2}$$

Divide -6 by -2 to get 3.

$$x^{2}=3$$

Take the square root of both sides of the equation.

$$x=\sqrt{3} x=-\sqrt{3}$$

Steps Using the Quadratic Formula

Subtract 2 from both sides.

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

Subtract 2 from 8 to get 6.

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

Quadratic equations like this one, with an x^{2} term but no x term, can still be solved using the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}, once they are put in standard form: ax^{2}+bx+c=0.

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

This equation is in standard form: ax^{2}+bx+c=0. Substitute -2 for a, 0 for b, and 6 for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$x=\frac{0±\sqrt{0^{2}-4\left(-2\right)\times 6}}{2\left(-2\right)}$$

Square 0.

$$x=\frac{0±\sqrt{-4\left(-2\right)\times 6}}{2\left(-2\right)}$$

Multiply -4 times -2.

$$x=\frac{0±\sqrt{8\times 6}}{2\left(-2\right)}$$

Multiply 8 times 6.

$$x=\frac{0±\sqrt{48}}{2\left(-2\right)}$$

Take the square root of 48.

$$x=\frac{0±4\sqrt{3}}{2\left(-2\right)}$$

Multiply 2 times -2.

$$x=\frac{0±4\sqrt{3}}{-4}$$

Now solve the equation x=\frac{0±4\sqrt{3}}{-4} when ± is plus.

$$x=-\sqrt{3}$$

Now solve the equation x=\frac{0±4\sqrt{3}}{-4} when ± is minus.

$$x=\sqrt{3}$$

The equation is now solved.

$$x=-\sqrt{3} x=\sqrt{3}$$