20*x^2+12*x+0.9=37

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Solution for 20*x^2+12*x+0.9=37 equation:


Simplifying
20x2 + 12x + 0.9 = 37

Reorder the terms:
0.9 + 12x + 20x2 = 37

Solving
0.9 + 12x + 20x2 = 37

Solving for variable 'x'.

Reorder the terms:
0.9 + -37 + 12x + 20x2 = 37 + -37

Combine like terms: 0.9 + -37 = -36.1
-36.1 + 12x + 20x2 = 37 + -37

Combine like terms: 37 + -37 = 0
-36.1 + 12x + 20x2 = 0

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

Divide each side by '20'.
-1.805 + 0.6x + x2 = 0

Move the constant term to the right:

Add '1.805' to each side of the equation.
-1.805 + 0.6x + 1.805 + x2 = 0 + 1.805

Reorder the terms:
-1.805 + 1.805 + 0.6x + x2 = 0 + 1.805

Combine like terms: -1.805 + 1.805 = 0.000
0.000 + 0.6x + x2 = 0 + 1.805
0.6x + x2 = 0 + 1.805

Combine like terms: 0 + 1.805 = 1.805
0.6x + x2 = 1.805

The x term is 0.6x.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6x + 0.09 + x2 = 1.805 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = 1.805 + 0.09

Combine like terms: 1.805 + 0.09 = 1.895
0.09 + 0.6x + x2 = 1.895

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = 1.895

Calculate the square root of the right side: 1.37658999

Break this problem into two subproblems by setting 
(x + 0.3) equal to 1.37658999 and -1.37658999.

Subproblem 1

x + 0.3 = 1.37658999 Simplifying x + 0.3 = 1.37658999 Reorder the terms: 0.3 + x = 1.37658999 Solving 0.3 + x = 1.37658999 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = 1.37658999 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = 1.37658999 + -0.3 x = 1.37658999 + -0.3 Combine like terms: 1.37658999 + -0.3 = 1.07658999 x = 1.07658999 Simplifying x = 1.07658999

Subproblem 2

x + 0.3 = -1.37658999 Simplifying x + 0.3 = -1.37658999 Reorder the terms: 0.3 + x = -1.37658999 Solving 0.3 + x = -1.37658999 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = -1.37658999 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = -1.37658999 + -0.3 x = -1.37658999 + -0.3 Combine like terms: -1.37658999 + -0.3 = -1.67658999 x = -1.67658999 Simplifying x = -1.67658999

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.07658999, -1.67658999}

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