Solve x^2-4=30

$$x ^ { 2 } - 4 = 30$$

Solve for x

$$x=\sqrt{34}\approx 5.830951895$$

$$x=-\sqrt{34}\approx -5.830951895$$

Steps by Finding Square Root

Add 4 to both sides.

$$x^{2}=30+4$$

Add 30 and 4 to get 34.

$$x^{2}=34$$

Take the square root of both sides of the equation.

$$x=\sqrt{34} x=-\sqrt{34}$$

Steps Using the Quadratic Formula

Subtract 30 from both sides.

$$x^{2}-4-30=0$$

Subtract 30 from -4 to get -34.

$$x^{2}-34=0$$

This equation is in standard form: ax^{2}+bx+c=0. Substitute 1 for a, 0 for b, and -34 for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$x=\frac{0±\sqrt{0^{2}-4\left(-34\right)}}{2}$$

Square 0.

$$x=\frac{0±\sqrt{-4\left(-34\right)}}{2}$$

Multiply -4 times -34.

$$x=\frac{0±\sqrt{136}}{2}$$

Take the square root of 136.

$$x=\frac{0±2\sqrt{34}}{2}$$

Now solve the equation x=\frac{0±2\sqrt{34}}{2} when ± is plus.

$$x=\sqrt{34}$$

Now solve the equation x=\frac{0±2\sqrt{34}}{2} when ± is minus.

$$x=-\sqrt{34}$$

The equation is now solved.

$$x=\sqrt{34} x=-\sqrt{34}$$