40x^2-12x-3=0

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Solution for 40x^2-12x-3=0 equation:


Simplifying
40x2 + -12x + -3 = 0

Reorder the terms:
-3 + -12x + 40x2 = 0

Solving
-3 + -12x + 40x2 = 0

Solving for variable 'x'.

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

Divide each side by '40'.
-0.075 + -0.3x + x2 = 0

Move the constant term to the right:

Add '0.075' to each side of the equation.
-0.075 + -0.3x + 0.075 + x2 = 0 + 0.075

Reorder the terms:
-0.075 + 0.075 + -0.3x + x2 = 0 + 0.075

Combine like terms: -0.075 + 0.075 = 0.000
0.000 + -0.3x + x2 = 0 + 0.075
-0.3x + x2 = 0 + 0.075

Combine like terms: 0 + 0.075 = 0.075
-0.3x + x2 = 0.075

The x term is -0.3x.  Take half its coefficient (-0.15).
Square it (0.0225) and add it to both sides.

Add '0.0225' to each side of the equation.
-0.3x + 0.0225 + x2 = 0.075 + 0.0225

Reorder the terms:
0.0225 + -0.3x + x2 = 0.075 + 0.0225

Combine like terms: 0.075 + 0.0225 = 0.0975
0.0225 + -0.3x + x2 = 0.0975

Factor a perfect square on the left side:
(x + -0.15)(x + -0.15) = 0.0975

Calculate the square root of the right side: 0.3122499

Break this problem into two subproblems by setting 
(x + -0.15) equal to 0.3122499 and -0.3122499.

Subproblem 1

x + -0.15 = 0.3122499 Simplifying x + -0.15 = 0.3122499 Reorder the terms: -0.15 + x = 0.3122499 Solving -0.15 + x = 0.3122499 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.15' to each side of the equation. -0.15 + 0.15 + x = 0.3122499 + 0.15 Combine like terms: -0.15 + 0.15 = 0.00 0.00 + x = 0.3122499 + 0.15 x = 0.3122499 + 0.15 Combine like terms: 0.3122499 + 0.15 = 0.4622499 x = 0.4622499 Simplifying x = 0.4622499

Subproblem 2

x + -0.15 = -0.3122499 Simplifying x + -0.15 = -0.3122499 Reorder the terms: -0.15 + x = -0.3122499 Solving -0.15 + x = -0.3122499 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.15' to each side of the equation. -0.15 + 0.15 + x = -0.3122499 + 0.15 Combine like terms: -0.15 + 0.15 = 0.00 0.00 + x = -0.3122499 + 0.15 x = -0.3122499 + 0.15 Combine like terms: -0.3122499 + 0.15 = -0.1622499 x = -0.1622499 Simplifying x = -0.1622499

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.4622499, -0.1622499}

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