.5x^2+2x=240

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Solution for .5x^2+2x=240 equation:


Simplifying
0.5x2 + 2x = 240

Reorder the terms:
2x + 0.5x2 = 240

Solving
2x + 0.5x2 = 240

Solving for variable 'x'.

Reorder the terms:
-240 + 2x + 0.5x2 = 240 + -240

Combine like terms: 240 + -240 = 0
-240 + 2x + 0.5x2 = 0

Begin completing the square.  Divide all terms by
0.5 the coefficient of the squared term: 

Divide each side by '0.5'.
-480 + 4x + x2 = 0

Move the constant term to the right:

Add '480' to each side of the equation.
-480 + 4x + 480 + x2 = 0 + 480

Reorder the terms:
-480 + 480 + 4x + x2 = 0 + 480

Combine like terms: -480 + 480 = 0
0 + 4x + x2 = 0 + 480
4x + x2 = 0 + 480

Combine like terms: 0 + 480 = 480
4x + x2 = 480

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 = 480 + 4

Reorder the terms:
4 + 4x + x2 = 480 + 4

Combine like terms: 480 + 4 = 484
4 + 4x + x2 = 484

Factor a perfect square on the left side:
(x + 2)(x + 2) = 484

Calculate the square root of the right side: 22

Break this problem into two subproblems by setting 
(x + 2) equal to 22 and -22.

Subproblem 1

x + 2 = 22 Simplifying x + 2 = 22 Reorder the terms: 2 + x = 22 Solving 2 + x = 22 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 = 22 + -2 Combine like terms: 2 + -2 = 0 0 + x = 22 + -2 x = 22 + -2 Combine like terms: 22 + -2 = 20 x = 20 Simplifying x = 20

Subproblem 2

x + 2 = -22 Simplifying x + 2 = -22 Reorder the terms: 2 + x = -22 Solving 2 + x = -22 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 = -22 + -2 Combine like terms: 2 + -2 = 0 0 + x = -22 + -2 x = -22 + -2 Combine like terms: -22 + -2 = -24 x = -24 Simplifying x = -24

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20, -24}

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