Solve X*X=9

$$X \times X = 9$$

Solve for X

$$X=3$$

$$X=-3$$

Steps by Finding Square Root

Multiply X and X to get X^{2}.

$$X^{2}=9$$

Take the square root of both sides of the equation.

$$X=3 X=-3$$

Steps Using the Quadratic Formula

Multiply X and X to get X^{2}.

$$X^{2}=9$$

Subtract 9 from both sides.

$$X^{2}-9=0$$

This equation is in standard form: ax^{2}+bx+c=0. Substitute 1 for a, 0 for b, and -9 for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$X=\frac{0±\sqrt{0^{2}-4\left(-9\right)}}{2}$$

Square 0.

$$X=\frac{0±\sqrt{-4\left(-9\right)}}{2}$$

Multiply -4 times -9.

$$X=\frac{0±\sqrt{36}}{2}$$

Take the square root of 36.

$$X=\frac{0±6}{2}$$

Now solve the equation X=\frac{0±6}{2} when ± is plus. Divide 6 by 2.

$$X=3$$

Now solve the equation X=\frac{0±6}{2} when ± is minus. Divide -6 by 2.

$$X=-3$$

The equation is now solved.

$$X=3 X=-3$$