20x^2+12x-9=0

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Solution for 20x^2+12x-9=0 equation:


Simplifying
20x2 + 12x + -9 = 0

Reorder the terms:
-9 + 12x + 20x2 = 0

Solving
-9 + 12x + 20x2 = 0

Solving for variable 'x'.

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

Divide each side by '20'.
-0.45 + 0.6x + x2 = 0

Move the constant term to the right:

Add '0.45' to each side of the equation.
-0.45 + 0.6x + 0.45 + x2 = 0 + 0.45

Reorder the terms:
-0.45 + 0.45 + 0.6x + x2 = 0 + 0.45

Combine like terms: -0.45 + 0.45 = 0.00
0.00 + 0.6x + x2 = 0 + 0.45
0.6x + x2 = 0 + 0.45

Combine like terms: 0 + 0.45 = 0.45
0.6x + x2 = 0.45

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 = 0.45 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = 0.45 + 0.09

Combine like terms: 0.45 + 0.09 = 0.54
0.09 + 0.6x + x2 = 0.54

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = 0.54

Calculate the square root of the right side: 0.734846923

Break this problem into two subproblems by setting 
(x + 0.3) equal to 0.734846923 and -0.734846923.

Subproblem 1

x + 0.3 = 0.734846923 Simplifying x + 0.3 = 0.734846923 Reorder the terms: 0.3 + x = 0.734846923 Solving 0.3 + x = 0.734846923 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 = 0.734846923 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = 0.734846923 + -0.3 x = 0.734846923 + -0.3 Combine like terms: 0.734846923 + -0.3 = 0.434846923 x = 0.434846923 Simplifying x = 0.434846923

Subproblem 2

x + 0.3 = -0.734846923 Simplifying x + 0.3 = -0.734846923 Reorder the terms: 0.3 + x = -0.734846923 Solving 0.3 + x = -0.734846923 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 = -0.734846923 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = -0.734846923 + -0.3 x = -0.734846923 + -0.3 Combine like terms: -0.734846923 + -0.3 = -1.034846923 x = -1.034846923 Simplifying x = -1.034846923

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.434846923, -1.034846923}

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