Solve x*x=9*49

$$x \times x=9 \times 49$$

Solve for x

$$x=21$$

$$x=-21$$

Steps by Finding Square Root

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

$$x^{2}=9\times 49$$

Multiply 9 and 49 to get 441.

$$x^{2}=441$$

Take the square root of both sides of the equation.

$$x=21 x=-21$$

Steps Using the Quadratic Formula

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

$$x^{2}=9\times 49$$

Multiply 9 and 49 to get 441.

$$x^{2}=441$$

Subtract 441 from both sides.

$$x^{2}-441=0$$

This equation is in standard form: ax^{2}+bx+c=0. Substitute 1 for a, 0 for b, and -441 for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$x=\frac{0±\sqrt{0^{2}-4\left(-441\right)}}{2}$$

Square 0.

$$x=\frac{0±\sqrt{-4\left(-441\right)}}{2}$$

Multiply -4 times -441.

$$x=\frac{0±\sqrt{1764}}{2}$$

Take the square root of 1764.

$$x=\frac{0±42}{2}$$

Now solve the equation x=\frac{0±42}{2} when ± is plus. Divide 42 by 2.

$$x=21$$

Now solve the equation x=\frac{0±42}{2} when ± is minus. Divide -42 by 2.

$$x=-21$$

The equation is now solved.

$$x=21 x=-21$$