Solve 2x^2-188=0

$$2 x ^ { 2 } - 188 = 0$$

Solve for x

$$x=\sqrt{94}\approx 9.695359715$$

$$x=-\sqrt{94}\approx -9.695359715$$

Steps by Finding Square Root

Add 188 to both sides. Anything plus zero gives itself.

$$2x^{2}=188$$

Divide both sides by 2.

$$x^{2}=\frac{188}{2}$$

Divide 188 by 2 to get 94.

$$x^{2}=94$$

Take the square root of both sides of the equation.

$$x=\sqrt{94} x=-\sqrt{94}$$

Steps Using the Quadratic Formula

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.

$$2x^{2}-188=0$$

This equation is in standard form: ax^{2}+bx+c=0. Substitute 2 for a, 0 for b, and -188 for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$x=\frac{0±\sqrt{0^{2}-4\times 2\left(-188\right)}}{2\times 2}$$

Square 0.

$$x=\frac{0±\sqrt{-4\times 2\left(-188\right)}}{2\times 2}$$

Multiply -4 times 2.

$$x=\frac{0±\sqrt{-8\left(-188\right)}}{2\times 2}$$

Multiply -8 times -188.

$$x=\frac{0±\sqrt{1504}}{2\times 2}$$

Take the square root of 1504.

$$x=\frac{0±4\sqrt{94}}{2\times 2}$$

Multiply 2 times 2.

$$x=\frac{0±4\sqrt{94}}{4}$$

Now solve the equation x=\frac{0±4\sqrt{94}}{4} when ± is plus.

$$x=\sqrt{94}$$

Now solve the equation x=\frac{0±4\sqrt{94}}{4} when ± is minus.

$$x=-\sqrt{94}$$

The equation is now solved.

$$x=\sqrt{94} x=-\sqrt{94}$$