x^2+4x-240=0

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Solution for x^2+4x-240=0 equation:


Simplifying
x2 + 4x + -240 = 0

Reorder the terms:
-240 + 4x + x2 = 0

Solving
-240 + 4x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '240' to each side of the equation.
-240 + 4x + 240 + x2 = 0 + 240

Reorder the terms:
-240 + 240 + 4x + x2 = 0 + 240

Combine like terms: -240 + 240 = 0
0 + 4x + x2 = 0 + 240
4x + x2 = 0 + 240

Combine like terms: 0 + 240 = 240
4x + x2 = 240

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 240 + 4

Reorder the terms:
4 + 4x + x2 = 240 + 4

Combine like terms: 240 + 4 = 244
4 + 4x + x2 = 244

Factor a perfect square on the left side:
(x + 2)(x + 2) = 244

Calculate the square root of the right side: 15.620499352

Break this problem into two subproblems by setting 
(x + 2) equal to 15.620499352 and -15.620499352.

Subproblem 1

x + 2 = 15.620499352 Simplifying x + 2 = 15.620499352 Reorder the terms: 2 + x = 15.620499352 Solving 2 + x = 15.620499352 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 15.620499352 + -2 Combine like terms: 2 + -2 = 0 0 + x = 15.620499352 + -2 x = 15.620499352 + -2 Combine like terms: 15.620499352 + -2 = 13.620499352 x = 13.620499352 Simplifying x = 13.620499352

Subproblem 2

x + 2 = -15.620499352 Simplifying x + 2 = -15.620499352 Reorder the terms: 2 + x = -15.620499352 Solving 2 + x = -15.620499352 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -15.620499352 + -2 Combine like terms: 2 + -2 = 0 0 + x = -15.620499352 + -2 x = -15.620499352 + -2 Combine like terms: -15.620499352 + -2 = -17.620499352 x = -17.620499352 Simplifying x = -17.620499352

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.620499352, -17.620499352}

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