0.5x^2-5x=12

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Solution for 0.5x^2-5x=12 equation:


Simplifying
0.5x2 + -5x = 12

Reorder the terms:
-5x + 0.5x2 = 12

Solving
-5x + 0.5x2 = 12

Solving for variable 'x'.

Reorder the terms:
-12 + -5x + 0.5x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-12 + -5x + 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'.
-24 + -10x + x2 = 0

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + -10x + 24 + x2 = 0 + 24

Reorder the terms:
-24 + 24 + -10x + x2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + -10x + x2 = 0 + 24
-10x + x2 = 0 + 24

Combine like terms: 0 + 24 = 24
-10x + x2 = 24

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = 24 + 25

Reorder the terms:
25 + -10x + x2 = 24 + 25

Combine like terms: 24 + 25 = 49
25 + -10x + x2 = 49

Factor a perfect square on the left side:
(x + -5)(x + -5) = 49

Calculate the square root of the right side: 7

Break this problem into two subproblems by setting 
(x + -5) equal to 7 and -7.

Subproblem 1

x + -5 = 7 Simplifying x + -5 = 7 Reorder the terms: -5 + x = 7 Solving -5 + x = 7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 7 + 5 Combine like terms: -5 + 5 = 0 0 + x = 7 + 5 x = 7 + 5 Combine like terms: 7 + 5 = 12 x = 12 Simplifying x = 12

Subproblem 2

x + -5 = -7 Simplifying x + -5 = -7 Reorder the terms: -5 + x = -7 Solving -5 + x = -7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -7 + 5 Combine like terms: -5 + 5 = 0 0 + x = -7 + 5 x = -7 + 5 Combine like terms: -7 + 5 = -2 x = -2 Simplifying x = -2

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12, -2}

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