Solve u^2+5=3

$$u ^ { 2 } + 5 = 3$$

Solve for u

$$u=-\sqrt{2}i\approx -0-1.414213562i$$

$$u=\sqrt{2}i\approx 1.414213562i$$

Steps by Finding Square Root

Subtract 5 from both sides.

$$u^{2}=3-5$$

Subtract 5 from 3 to get -2.

$$u^{2}=-2$$

The equation is now solved.

$$u=\sqrt{2}i u=-\sqrt{2}i$$

Steps Using the Quadratic Formula

Subtract 3 from both sides.

$$u^{2}+5-3=0$$

Subtract 3 from 5 to get 2.

$$u^{2}+2=0$$

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

$$u=\frac{0±\sqrt{0^{2}-4\times 2}}{2}$$

Square 0.

$$u=\frac{0±\sqrt{-4\times 2}}{2}$$

Multiply -4 times 2.

$$u=\frac{0±\sqrt{-8}}{2}$$

Take the square root of -8.

$$u=\frac{0±2\sqrt{2}i}{2}$$

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

$$u=\sqrt{2}i$$

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

$$u=-\sqrt{2}i$$

The equation is now solved.

$$u=\sqrt{2}i u=-\sqrt{2}i$$