4.1=-0.5x^2+1x+12

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Solution for 4.1=-0.5x^2+1x+12 equation:


Simplifying
4.1 = -0.5x2 + 1x + 12

Reorder the terms:
4.1 = 12 + 1x + -0.5x2

Solving
4.1 = 12 + 1x + -0.5x2

Solving for variable 'x'.

Combine like terms: 4.1 + -12 = -7.9
-7.9 + -1x + 0.5x2 = 12 + 1x + -0.5x2 + -12 + -1x + 0.5x2

Reorder the terms:
-7.9 + -1x + 0.5x2 = 12 + -12 + 1x + -1x + -0.5x2 + 0.5x2

Combine like terms: 12 + -12 = 0
-7.9 + -1x + 0.5x2 = 0 + 1x + -1x + -0.5x2 + 0.5x2
-7.9 + -1x + 0.5x2 = 1x + -1x + -0.5x2 + 0.5x2

Combine like terms: 1x + -1x = 0
-7.9 + -1x + 0.5x2 = 0 + -0.5x2 + 0.5x2
-7.9 + -1x + 0.5x2 = -0.5x2 + 0.5x2

Combine like terms: -0.5x2 + 0.5x2 = 0.0
-7.9 + -1x + 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'.
-15.8 + -2x + x2 = 0

Move the constant term to the right:

Add '15.8' to each side of the equation.
-15.8 + -2x + 15.8 + x2 = 0 + 15.8

Reorder the terms:
-15.8 + 15.8 + -2x + x2 = 0 + 15.8

Combine like terms: -15.8 + 15.8 = 0.0
0.0 + -2x + x2 = 0 + 15.8
-2x + x2 = 0 + 15.8

Combine like terms: 0 + 15.8 = 15.8
-2x + x2 = 15.8

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 15.8 + 1

Reorder the terms:
1 + -2x + x2 = 15.8 + 1

Combine like terms: 15.8 + 1 = 16.8
1 + -2x + x2 = 16.8

Factor a perfect square on the left side:
(x + -1)(x + -1) = 16.8

Calculate the square root of the right side: 4.098780306

Break this problem into two subproblems by setting 
(x + -1) equal to 4.098780306 and -4.098780306.

Subproblem 1

x + -1 = 4.098780306 Simplifying x + -1 = 4.098780306 Reorder the terms: -1 + x = 4.098780306 Solving -1 + x = 4.098780306 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 4.098780306 + 1 Combine like terms: -1 + 1 = 0 0 + x = 4.098780306 + 1 x = 4.098780306 + 1 Combine like terms: 4.098780306 + 1 = 5.098780306 x = 5.098780306 Simplifying x = 5.098780306

Subproblem 2

x + -1 = -4.098780306 Simplifying x + -1 = -4.098780306 Reorder the terms: -1 + x = -4.098780306 Solving -1 + x = -4.098780306 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -4.098780306 + 1 Combine like terms: -1 + 1 = 0 0 + x = -4.098780306 + 1 x = -4.098780306 + 1 Combine like terms: -4.098780306 + 1 = -3.098780306 x = -3.098780306 Simplifying x = -3.098780306

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.098780306, -3.098780306}

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