40x^2-3x-0.28=0

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Solution for 40x^2-3x-0.28=0 equation:


Simplifying
40x2 + -3x + -0.28 = 0

Reorder the terms:
-0.28 + -3x + 40x2 = 0

Solving
-0.28 + -3x + 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'.
-0.007 + -0.075x + x2 = 0

Move the constant term to the right:

Add '0.007' to each side of the equation.
-0.007 + -0.075x + 0.007 + x2 = 0 + 0.007

Reorder the terms:
-0.007 + 0.007 + -0.075x + x2 = 0 + 0.007

Combine like terms: -0.007 + 0.007 = 0.000
0.000 + -0.075x + x2 = 0 + 0.007
-0.075x + x2 = 0 + 0.007

Combine like terms: 0 + 0.007 = 0.007
-0.075x + x2 = 0.007

The x term is -0.075x.  Take half its coefficient (-0.0375).
Square it (0.00140625) and add it to both sides.

Add '0.00140625' to each side of the equation.
-0.075x + 0.00140625 + x2 = 0.007 + 0.00140625

Reorder the terms:
0.00140625 + -0.075x + x2 = 0.007 + 0.00140625

Combine like terms: 0.007 + 0.00140625 = 0.00840625
0.00140625 + -0.075x + x2 = 0.00840625

Factor a perfect square on the left side:
(x + -0.0375)(x + -0.0375) = 0.00840625

Calculate the square root of the right side: 0.091685604

Break this problem into two subproblems by setting 
(x + -0.0375) equal to 0.091685604 and -0.091685604.

Subproblem 1

x + -0.0375 = 0.091685604 Simplifying x + -0.0375 = 0.091685604 Reorder the terms: -0.0375 + x = 0.091685604 Solving -0.0375 + x = 0.091685604 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.0375' to each side of the equation. -0.0375 + 0.0375 + x = 0.091685604 + 0.0375 Combine like terms: -0.0375 + 0.0375 = 0.0000 0.0000 + x = 0.091685604 + 0.0375 x = 0.091685604 + 0.0375 Combine like terms: 0.091685604 + 0.0375 = 0.129185604 x = 0.129185604 Simplifying x = 0.129185604

Subproblem 2

x + -0.0375 = -0.091685604 Simplifying x + -0.0375 = -0.091685604 Reorder the terms: -0.0375 + x = -0.091685604 Solving -0.0375 + x = -0.091685604 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.0375' to each side of the equation. -0.0375 + 0.0375 + x = -0.091685604 + 0.0375 Combine like terms: -0.0375 + 0.0375 = 0.0000 0.0000 + x = -0.091685604 + 0.0375 x = -0.091685604 + 0.0375 Combine like terms: -0.091685604 + 0.0375 = -0.054185604 x = -0.054185604 Simplifying x = -0.054185604

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.129185604, -0.054185604}

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