(x^2)+3x=240

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Solution for (x^2)+3x=240 equation:


Simplifying
(x2) + 3x = 240
x2 + 3x = 240

Reorder the terms:
3x + x2 = 240

Solving
3x + x2 = 240

Solving for variable 'x'.

Reorder the terms:
-240 + 3x + x2 = 240 + -240

Combine like terms: 240 + -240 = 0
-240 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '240' to each side of the equation.
-240 + 3x + 240 + x2 = 0 + 240

Reorder the terms:
-240 + 240 + 3x + x2 = 0 + 240

Combine like terms: -240 + 240 = 0
0 + 3x + x2 = 0 + 240
3x + x2 = 0 + 240

Combine like terms: 0 + 240 = 240
3x + x2 = 240

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 240 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 240 + 2.25

Combine like terms: 240 + 2.25 = 242.25
2.25 + 3x + x2 = 242.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 242.25

Calculate the square root of the right side: 15.564382416

Break this problem into two subproblems by setting 
(x + 1.5) equal to 15.564382416 and -15.564382416.

Subproblem 1

x + 1.5 = 15.564382416 Simplifying x + 1.5 = 15.564382416 Reorder the terms: 1.5 + x = 15.564382416 Solving 1.5 + x = 15.564382416 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 15.564382416 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 15.564382416 + -1.5 x = 15.564382416 + -1.5 Combine like terms: 15.564382416 + -1.5 = 14.064382416 x = 14.064382416 Simplifying x = 14.064382416

Subproblem 2

x + 1.5 = -15.564382416 Simplifying x + 1.5 = -15.564382416 Reorder the terms: 1.5 + x = -15.564382416 Solving 1.5 + x = -15.564382416 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -15.564382416 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -15.564382416 + -1.5 x = -15.564382416 + -1.5 Combine like terms: -15.564382416 + -1.5 = -17.064382416 x = -17.064382416 Simplifying x = -17.064382416

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.064382416, -17.064382416}

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