0=400-117.2x-x^2

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Solution for 0=400-117.2x-x^2 equation:


Simplifying
0 = 400 + -117.2x + -1x2

Solving
0 = 400 + -117.2x + -1x2

Solving for variable 'x'.

Combine like terms: 0 + -400 = -400
-400 + 117.2x + x2 = 400 + -117.2x + -1x2 + -400 + 117.2x + x2

Reorder the terms:
-400 + 117.2x + x2 = 400 + -400 + -117.2x + 117.2x + -1x2 + x2

Combine like terms: 400 + -400 = 0
-400 + 117.2x + x2 = 0 + -117.2x + 117.2x + -1x2 + x2
-400 + 117.2x + x2 = -117.2x + 117.2x + -1x2 + x2

Combine like terms: -117.2x + 117.2x = 0.0
-400 + 117.2x + x2 = 0.0 + -1x2 + x2
-400 + 117.2x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
-400 + 117.2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '400' to each side of the equation.
-400 + 117.2x + 400 + x2 = 0 + 400

Reorder the terms:
-400 + 400 + 117.2x + x2 = 0 + 400

Combine like terms: -400 + 400 = 0
0 + 117.2x + x2 = 0 + 400
117.2x + x2 = 0 + 400

Combine like terms: 0 + 400 = 400
117.2x + x2 = 400

The x term is 117.2x.  Take half its coefficient (58.6).
Square it (3433.96) and add it to both sides.

Add '3433.96' to each side of the equation.
117.2x + 3433.96 + x2 = 400 + 3433.96

Reorder the terms:
3433.96 + 117.2x + x2 = 400 + 3433.96

Combine like terms: 400 + 3433.96 = 3833.96
3433.96 + 117.2x + x2 = 3833.96

Factor a perfect square on the left side:
(x + 58.6)(x + 58.6) = 3833.96

Calculate the square root of the right side: 61.91897932

Break this problem into two subproblems by setting 
(x + 58.6) equal to 61.91897932 and -61.91897932.

Subproblem 1

x + 58.6 = 61.91897932 Simplifying x + 58.6 = 61.91897932 Reorder the terms: 58.6 + x = 61.91897932 Solving 58.6 + x = 61.91897932 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-58.6' to each side of the equation. 58.6 + -58.6 + x = 61.91897932 + -58.6 Combine like terms: 58.6 + -58.6 = 0.0 0.0 + x = 61.91897932 + -58.6 x = 61.91897932 + -58.6 Combine like terms: 61.91897932 + -58.6 = 3.31897932 x = 3.31897932 Simplifying x = 3.31897932

Subproblem 2

x + 58.6 = -61.91897932 Simplifying x + 58.6 = -61.91897932 Reorder the terms: 58.6 + x = -61.91897932 Solving 58.6 + x = -61.91897932 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-58.6' to each side of the equation. 58.6 + -58.6 + x = -61.91897932 + -58.6 Combine like terms: 58.6 + -58.6 = 0.0 0.0 + x = -61.91897932 + -58.6 x = -61.91897932 + -58.6 Combine like terms: -61.91897932 + -58.6 = -120.51897932 x = -120.51897932 Simplifying x = -120.51897932

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.31897932, -120.51897932}

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