0.5x^2-x=8

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Solution for 0.5x^2-x=8 equation:


Simplifying
0.5x2 + -1x = 8

Reorder the terms:
-1x + 0.5x2 = 8

Solving
-1x + 0.5x2 = 8

Solving for variable 'x'.

Reorder the terms:
-8 + -1x + 0.5x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-8 + -1x + 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'.
-16 + -2x + x2 = 0

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + -2x + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + -2x + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + -2x + x2 = 0 + 16
-2x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
-2x + x2 = 16

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 = 16 + 1

Reorder the terms:
1 + -2x + x2 = 16 + 1

Combine like terms: 16 + 1 = 17
1 + -2x + x2 = 17

Factor a perfect square on the left side:
(x + -1)(x + -1) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(x + -1) equal to 4.123105626 and -4.123105626.

Subproblem 1

x + -1 = 4.123105626 Simplifying x + -1 = 4.123105626 Reorder the terms: -1 + x = 4.123105626 Solving -1 + x = 4.123105626 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 = 4.123105626 + 1 Combine like terms: -1 + 1 = 0 0 + x = 4.123105626 + 1 x = 4.123105626 + 1 Combine like terms: 4.123105626 + 1 = 5.123105626 x = 5.123105626 Simplifying x = 5.123105626

Subproblem 2

x + -1 = -4.123105626 Simplifying x + -1 = -4.123105626 Reorder the terms: -1 + x = -4.123105626 Solving -1 + x = -4.123105626 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 = -4.123105626 + 1 Combine like terms: -1 + 1 = 0 0 + x = -4.123105626 + 1 x = -4.123105626 + 1 Combine like terms: -4.123105626 + 1 = -3.123105626 x = -3.123105626 Simplifying x = -3.123105626

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.123105626, -3.123105626}

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