.5x^2-x-12=0

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Solution for .5x^2-x-12=0 equation:


Simplifying
0.5x2 + -1x + -12 = 0

Reorder the terms:
-12 + -1x + 0.5x2 = 0

Solving
-12 + -1x + 0.5x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.5'.
-24 + -2x + x2 = 0

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + -2x + 24 + x2 = 0 + 24

Reorder the terms:
-24 + 24 + -2x + x2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + -2x + x2 = 0 + 24
-2x + x2 = 0 + 24

Combine like terms: 0 + 24 = 24
-2x + x2 = 24

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 = 24 + 1

Reorder the terms:
1 + -2x + x2 = 24 + 1

Combine like terms: 24 + 1 = 25
1 + -2x + x2 = 25

Factor a perfect square on the left side:
(x + -1)(x + -1) = 25

Calculate the square root of the right side: 5

Break this problem into two subproblems by setting 
(x + -1) equal to 5 and -5.

Subproblem 1

x + -1 = 5 Simplifying x + -1 = 5 Reorder the terms: -1 + x = 5 Solving -1 + x = 5 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 = 5 + 1 Combine like terms: -1 + 1 = 0 0 + x = 5 + 1 x = 5 + 1 Combine like terms: 5 + 1 = 6 x = 6 Simplifying x = 6

Subproblem 2

x + -1 = -5 Simplifying x + -1 = -5 Reorder the terms: -1 + x = -5 Solving -1 + x = -5 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 = -5 + 1 Combine like terms: -1 + 1 = 0 0 + x = -5 + 1 x = -5 + 1 Combine like terms: -5 + 1 = -4 x = -4 Simplifying x = -4

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6, -4}

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