0=0.01x^2+0.1x-12

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Solution for 0=0.01x^2+0.1x-12 equation:


Simplifying
0 = 0.01x2 + 0.1x + -12

Reorder the terms:
0 = -12 + 0.1x + 0.01x2

Solving
0 = -12 + 0.1x + 0.01x2

Solving for variable 'x'.

Combine like terms: 0 + 12 = 12
12 + -0.1x + -0.01x2 = -12 + 0.1x + 0.01x2 + 12 + -0.1x + -0.01x2

Reorder the terms:
12 + -0.1x + -0.01x2 = -12 + 12 + 0.1x + -0.1x + 0.01x2 + -0.01x2

Combine like terms: -12 + 12 = 0
12 + -0.1x + -0.01x2 = 0 + 0.1x + -0.1x + 0.01x2 + -0.01x2
12 + -0.1x + -0.01x2 = 0.1x + -0.1x + 0.01x2 + -0.01x2

Combine like terms: 0.1x + -0.1x = 0.0
12 + -0.1x + -0.01x2 = 0.0 + 0.01x2 + -0.01x2
12 + -0.1x + -0.01x2 = 0.01x2 + -0.01x2

Combine like terms: 0.01x2 + -0.01x2 = 0.00
12 + -0.1x + -0.01x2 = 0.00

Begin completing the square.  Divide all terms by
-0.01 the coefficient of the squared term: 

Divide each side by '-0.01'.
-1200 + 10x + x2 = 0

Move the constant term to the right:

Add '1200' to each side of the equation.
-1200 + 10x + 1200 + x2 = 0 + 1200

Reorder the terms:
-1200 + 1200 + 10x + x2 = 0 + 1200

Combine like terms: -1200 + 1200 = 0
0 + 10x + x2 = 0 + 1200
10x + x2 = 0 + 1200

Combine like terms: 0 + 1200 = 1200
10x + x2 = 1200

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 = 1200 + 25

Reorder the terms:
25 + 10x + x2 = 1200 + 25

Combine like terms: 1200 + 25 = 1225
25 + 10x + x2 = 1225

Factor a perfect square on the left side:
(x + 5)(x + 5) = 1225

Calculate the square root of the right side: 35

Break this problem into two subproblems by setting 
(x + 5) equal to 35 and -35.

Subproblem 1

x + 5 = 35 Simplifying x + 5 = 35 Reorder the terms: 5 + x = 35 Solving 5 + x = 35 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 = 35 + -5 Combine like terms: 5 + -5 = 0 0 + x = 35 + -5 x = 35 + -5 Combine like terms: 35 + -5 = 30 x = 30 Simplifying x = 30

Subproblem 2

x + 5 = -35 Simplifying x + 5 = -35 Reorder the terms: 5 + x = -35 Solving 5 + x = -35 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 = -35 + -5 Combine like terms: 5 + -5 = 0 0 + x = -35 + -5 x = -35 + -5 Combine like terms: -35 + -5 = -40 x = -40 Simplifying x = -40

Solution

The solution to the problem is based on the solutions from the subproblems. x = {30, -40}

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