40x^2+9x-106=0

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Solution for 40x^2+9x-106=0 equation:


Simplifying
40x2 + 9x + -106 = 0

Reorder the terms:
-106 + 9x + 40x2 = 0

Solving
-106 + 9x + 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'.
-2.65 + 0.225x + x2 = 0

Move the constant term to the right:

Add '2.65' to each side of the equation.
-2.65 + 0.225x + 2.65 + x2 = 0 + 2.65

Reorder the terms:
-2.65 + 2.65 + 0.225x + x2 = 0 + 2.65

Combine like terms: -2.65 + 2.65 = 0.00
0.00 + 0.225x + x2 = 0 + 2.65
0.225x + x2 = 0 + 2.65

Combine like terms: 0 + 2.65 = 2.65
0.225x + x2 = 2.65

The x term is 0.225x.  Take half its coefficient (0.1125).
Square it (0.01265625) and add it to both sides.

Add '0.01265625' to each side of the equation.
0.225x + 0.01265625 + x2 = 2.65 + 0.01265625

Reorder the terms:
0.01265625 + 0.225x + x2 = 2.65 + 0.01265625

Combine like terms: 2.65 + 0.01265625 = 2.66265625
0.01265625 + 0.225x + x2 = 2.66265625

Factor a perfect square on the left side:
(x + 0.1125)(x + 0.1125) = 2.66265625

Calculate the square root of the right side: 1.631764766

Break this problem into two subproblems by setting 
(x + 0.1125) equal to 1.631764766 and -1.631764766.

Subproblem 1

x + 0.1125 = 1.631764766 Simplifying x + 0.1125 = 1.631764766 Reorder the terms: 0.1125 + x = 1.631764766 Solving 0.1125 + x = 1.631764766 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1125' to each side of the equation. 0.1125 + -0.1125 + x = 1.631764766 + -0.1125 Combine like terms: 0.1125 + -0.1125 = 0.0000 0.0000 + x = 1.631764766 + -0.1125 x = 1.631764766 + -0.1125 Combine like terms: 1.631764766 + -0.1125 = 1.519264766 x = 1.519264766 Simplifying x = 1.519264766

Subproblem 2

x + 0.1125 = -1.631764766 Simplifying x + 0.1125 = -1.631764766 Reorder the terms: 0.1125 + x = -1.631764766 Solving 0.1125 + x = -1.631764766 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1125' to each side of the equation. 0.1125 + -0.1125 + x = -1.631764766 + -0.1125 Combine like terms: 0.1125 + -0.1125 = 0.0000 0.0000 + x = -1.631764766 + -0.1125 x = -1.631764766 + -0.1125 Combine like terms: -1.631764766 + -0.1125 = -1.744264766 x = -1.744264766 Simplifying x = -1.744264766

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.519264766, -1.744264766}

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