Solve 7x^2+49=2

$$7 x ^ { 2 } + 49 = 2$$

Solve for x (complex solution)

$$x=-\frac{\sqrt{329}i}{7}\approx -0-2.591193878i$$

$$x=\frac{\sqrt{329}i}{7}\approx 2.591193878i$$

Steps by Finding Square Root

Subtract 49 from both sides.

$$7x^{2}=2-49$$

Subtract 49 from 2 to get -47.

$$7x^{2}=-47$$

Divide both sides by 7.

$$x^{2}=-\frac{47}{7}$$

The equation is now solved.

$$x=\frac{\sqrt{329}i}{7} x=-\frac{\sqrt{329}i}{7}$$

Steps Using the Quadratic Formula

Subtract 2 from both sides.

$$7x^{2}+49-2=0$$

Subtract 2 from 49 to get 47.

$$7x^{2}+47=0$$

This equation is in standard form: ax^{2}+bx+c=0. Substitute 7 for a, 0 for b, and 47 for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$x=\frac{0±\sqrt{0^{2}-4\times 7\times 47}}{2\times 7}$$

Square 0.

$$x=\frac{0±\sqrt{-4\times 7\times 47}}{2\times 7}$$

Multiply -4 times 7.

$$x=\frac{0±\sqrt{-28\times 47}}{2\times 7}$$

Multiply -28 times 47.

$$x=\frac{0±\sqrt{-1316}}{2\times 7}$$

Take the square root of -1316.

$$x=\frac{0±2\sqrt{329}i}{2\times 7}$$

Multiply 2 times 7.

$$x=\frac{0±2\sqrt{329}i}{14}$$

Now solve the equation x=\frac{0±2\sqrt{329}i}{14} when ± is plus.

$$x=\frac{\sqrt{329}i}{7}$$

Now solve the equation x=\frac{0±2\sqrt{329}i}{14} when ± is minus.

$$x=-\frac{\sqrt{329}i}{7}$$

The equation is now solved.

$$x=\frac{\sqrt{329}i}{7} x=-\frac{\sqrt{329}i}{7}$$