Solve x^2+4x-48599=0

$${ x }^{ 2 } +4x-48599=0$$

Solve for x (complex solution)

$$x=\sqrt{48603}-2\approx 218.460880884$$

$$x=-\left(\sqrt{48603}+2\right)\approx -222.460880884$$

Steps Using the Quadratic Formula

All equations of the form ax^{2}+bx+c=0 can be solved using the quadratic formula: \frac{-b±\sqrt{b^{2}-4ac}}{2a}. The quadratic formula gives two solutions, one when ± is addition and one when it is subtraction.

$$x^{2}+4x-48599=0$$

This equation is in standard form: ax^{2}+bx+c=0. Substitute 1 for a, 4 for b, and -48599 for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$x=\frac{-4±\sqrt{4^{2}-4\left(-48599\right)}}{2}$$

Square 4.

$$x=\frac{-4±\sqrt{16-4\left(-48599\right)}}{2}$$

Multiply -4 times -48599.

$$x=\frac{-4±\sqrt{16+194396}}{2}$$

Add 16 to 194396.

$$x=\frac{-4±\sqrt{194412}}{2}$$

Take the square root of 194412.

$$x=\frac{-4±2\sqrt{48603}}{2}$$

Now solve the equation x=\frac{-4±2\sqrt{48603}}{2} when ± is plus. Add -4 to 2\sqrt{48603}.

$$x=\frac{2\sqrt{48603}-4}{2}$$

Divide -4+2\sqrt{48603} by 2.

$$x=\sqrt{48603}-2$$

Now solve the equation x=\frac{-4±2\sqrt{48603}}{2} when ± is minus. Subtract 2\sqrt{48603} from -4.

$$x=\frac{-2\sqrt{48603}-4}{2}$$

Divide -4-2\sqrt{48603} by 2.

$$x=-\sqrt{48603}-2$$

The equation is now solved.

$$x=\sqrt{48603}-2 x=-\sqrt{48603}-2$$

Steps for Completing the Square

Quadratic equations such as this one can be solved by completing the square. In order to complete the square, the equation must first be in the form x^{2}+bx=c.

$$x^{2}+4x-48599=0$$

Add 48599 to both sides of the equation.

$$x^{2}+4x-48599-\left(-48599\right)=-\left(-48599\right)$$

Subtracting -48599 from itself leaves 0.

$$x^{2}+4x=-\left(-48599\right)$$

Subtract -48599 from 0.

$$x^{2}+4x=48599$$

Divide 4, the coefficient of the x term, by 2 to get 2. Then add the square of 2 to both sides of the equation. This step makes the left hand side of the equation a perfect square.

$$x^{2}+4x+2^{2}=48599+2^{2}$$

Square 2.

$$x^{2}+4x+4=48599+4$$

Add 48599 to 4.

$$x^{2}+4x+4=48603$$

Factor x^{2}+4x+4. In general, when x^{2}+bx+c is a perfect square, it can always be factored as \left(x+\frac{b}{2}\right)^{2}.

$$\left(x+2\right)^{2}=48603$$

Take the square root of both sides of the equation.

$$\sqrt{\left(x+2\right)^{2}}=\sqrt{48603}$$

Simplify.

$$x+2=\sqrt{48603} x+2=-\sqrt{48603}$$

Subtract 2 from both sides of the equation.

$$x=\sqrt{48603}-2 x=-\sqrt{48603}-2$$

Solve for x

$$x=\sqrt{48603}-2\approx 218.460880884$$

$$x=-\sqrt{48603}-2\approx -222.460880884$$

Steps Using the Quadratic Formula

All equations of the form ax^{2}+bx+c=0 can be solved using the quadratic formula: \frac{-b±\sqrt{b^{2}-4ac}}{2a}. The quadratic formula gives two solutions, one when ± is addition and one when it is subtraction.

$$x^{2}+4x-48599=0$$

This equation is in standard form: ax^{2}+bx+c=0. Substitute 1 for a, 4 for b, and -48599 for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$x=\frac{-4±\sqrt{4^{2}-4\left(-48599\right)}}{2}$$

Square 4.

$$x=\frac{-4±\sqrt{16-4\left(-48599\right)}}{2}$$

Multiply -4 times -48599.

$$x=\frac{-4±\sqrt{16+194396}}{2}$$

Add 16 to 194396.

$$x=\frac{-4±\sqrt{194412}}{2}$$

Take the square root of 194412.

$$x=\frac{-4±2\sqrt{48603}}{2}$$

Now solve the equation x=\frac{-4±2\sqrt{48603}}{2} when ± is plus. Add -4 to 2\sqrt{48603}.

$$x=\frac{2\sqrt{48603}-4}{2}$$

Divide -4+2\sqrt{48603} by 2.

$$x=\sqrt{48603}-2$$

Now solve the equation x=\frac{-4±2\sqrt{48603}}{2} when ± is minus. Subtract 2\sqrt{48603} from -4.

$$x=\frac{-2\sqrt{48603}-4}{2}$$

Divide -4-2\sqrt{48603} by 2.

$$x=-\sqrt{48603}-2$$

The equation is now solved.

$$x=\sqrt{48603}-2 x=-\sqrt{48603}-2$$

Steps for Completing the Square

Quadratic equations such as this one can be solved by completing the square. In order to complete the square, the equation must first be in the form x^{2}+bx=c.

$$x^{2}+4x-48599=0$$

Add 48599 to both sides of the equation.

$$x^{2}+4x-48599-\left(-48599\right)=-\left(-48599\right)$$

Subtracting -48599 from itself leaves 0.

$$x^{2}+4x=-\left(-48599\right)$$

Subtract -48599 from 0.

$$x^{2}+4x=48599$$

Divide 4, the coefficient of the x term, by 2 to get 2. Then add the square of 2 to both sides of the equation. This step makes the left hand side of the equation a perfect square.

$$x^{2}+4x+2^{2}=48599+2^{2}$$

Square 2.

$$x^{2}+4x+4=48599+4$$

Add 48599 to 4.

$$x^{2}+4x+4=48603$$

Factor x^{2}+4x+4. In general, when x^{2}+bx+c is a perfect square, it can always be factored as \left(x+\frac{b}{2}\right)^{2}.

$$\left(x+2\right)^{2}=48603$$

Take the square root of both sides of the equation.

$$\sqrt{\left(x+2\right)^{2}}=\sqrt{48603}$$

Simplify.

$$x+2=\sqrt{48603} x+2=-\sqrt{48603}$$

Subtract 2 from both sides of the equation.

$$x=\sqrt{48603}-2 x=-\sqrt{48603}-2$$