8=120+2x-.5x^2

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Solution for 8=120+2x-.5x^2 equation:


Simplifying
8 = 120 + 2x + -0.5x2

Solving
8 = 120 + 2x + -0.5x2

Solving for variable 'x'.

Combine like terms: 8 + -120 = -112
-112 + -2x + 0.5x2 = 120 + 2x + -0.5x2 + -120 + -2x + 0.5x2

Reorder the terms:
-112 + -2x + 0.5x2 = 120 + -120 + 2x + -2x + -0.5x2 + 0.5x2

Combine like terms: 120 + -120 = 0
-112 + -2x + 0.5x2 = 0 + 2x + -2x + -0.5x2 + 0.5x2
-112 + -2x + 0.5x2 = 2x + -2x + -0.5x2 + 0.5x2

Combine like terms: 2x + -2x = 0
-112 + -2x + 0.5x2 = 0 + -0.5x2 + 0.5x2
-112 + -2x + 0.5x2 = -0.5x2 + 0.5x2

Combine like terms: -0.5x2 + 0.5x2 = 0.0
-112 + -2x + 0.5x2 = 0.0

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

Divide each side by '0.5'.
-224 + -4x + x2 = 0

Move the constant term to the right:

Add '224' to each side of the equation.
-224 + -4x + 224 + x2 = 0 + 224

Reorder the terms:
-224 + 224 + -4x + x2 = 0 + 224

Combine like terms: -224 + 224 = 0
0 + -4x + x2 = 0 + 224
-4x + x2 = 0 + 224

Combine like terms: 0 + 224 = 224
-4x + x2 = 224

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 = 224 + 4

Reorder the terms:
4 + -4x + x2 = 224 + 4

Combine like terms: 224 + 4 = 228
4 + -4x + x2 = 228

Factor a perfect square on the left side:
(x + -2)(x + -2) = 228

Calculate the square root of the right side: 15.099668871

Break this problem into two subproblems by setting 
(x + -2) equal to 15.099668871 and -15.099668871.

Subproblem 1

x + -2 = 15.099668871 Simplifying x + -2 = 15.099668871 Reorder the terms: -2 + x = 15.099668871 Solving -2 + x = 15.099668871 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 = 15.099668871 + 2 Combine like terms: -2 + 2 = 0 0 + x = 15.099668871 + 2 x = 15.099668871 + 2 Combine like terms: 15.099668871 + 2 = 17.099668871 x = 17.099668871 Simplifying x = 17.099668871

Subproblem 2

x + -2 = -15.099668871 Simplifying x + -2 = -15.099668871 Reorder the terms: -2 + x = -15.099668871 Solving -2 + x = -15.099668871 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 = -15.099668871 + 2 Combine like terms: -2 + 2 = 0 0 + x = -15.099668871 + 2 x = -15.099668871 + 2 Combine like terms: -15.099668871 + 2 = -13.099668871 x = -13.099668871 Simplifying x = -13.099668871

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.099668871, -13.099668871}

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