0=0.5x^2+5x+12.5

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Solution for 0=0.5x^2+5x+12.5 equation:


Simplifying
0 = 0.5x2 + 5x + 12.5

Reorder the terms:
0 = 12.5 + 5x + 0.5x2

Solving
0 = 12.5 + 5x + 0.5x2

Solving for variable 'x'.

Combine like terms: 0 + -12.5 = -12.5
-12.5 + -5x + -0.5x2 = 12.5 + 5x + 0.5x2 + -12.5 + -5x + -0.5x2

Reorder the terms:
-12.5 + -5x + -0.5x2 = 12.5 + -12.5 + 5x + -5x + 0.5x2 + -0.5x2

Combine like terms: 12.5 + -12.5 = 0.0
-12.5 + -5x + -0.5x2 = 0.0 + 5x + -5x + 0.5x2 + -0.5x2
-12.5 + -5x + -0.5x2 = 5x + -5x + 0.5x2 + -0.5x2

Combine like terms: 5x + -5x = 0
-12.5 + -5x + -0.5x2 = 0 + 0.5x2 + -0.5x2
-12.5 + -5x + -0.5x2 = 0.5x2 + -0.5x2

Combine like terms: 0.5x2 + -0.5x2 = 0.0
-12.5 + -5x + -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'.
25 + 10x + x2 = 0

Move the constant term to the right:

Add '-25' to each side of the equation.
25 + 10x + -25 + x2 = 0 + -25

Reorder the terms:
25 + -25 + 10x + x2 = 0 + -25

Combine like terms: 25 + -25 = 0
0 + 10x + x2 = 0 + -25
10x + x2 = 0 + -25

Combine like terms: 0 + -25 = -25
10x + x2 = -25

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 = -25 + 25

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

Combine like terms: -25 + 25 = 0
25 + 10x + x2 = 0

Factor a perfect square on the left side:
(x + 5)(x + 5) = 0

Calculate the square root of the right side: 0

Break this problem into two subproblems by setting 
(x + 5) equal to 0 and 0.

Subproblem 1

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

Subproblem 2

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

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-5, -5}

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