-8x^2-40x+3=0

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Solution for -8x^2-40x+3=0 equation:


Simplifying
-8x2 + -40x + 3 = 0

Reorder the terms:
3 + -40x + -8x2 = 0

Solving
3 + -40x + -8x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-8 the coefficient of the squared term: 

Divide each side by '-8'.
-0.375 + 5x + x2 = 0

Move the constant term to the right:

Add '0.375' to each side of the equation.
-0.375 + 5x + 0.375 + x2 = 0 + 0.375

Reorder the terms:
-0.375 + 0.375 + 5x + x2 = 0 + 0.375

Combine like terms: -0.375 + 0.375 = 0.000
0.000 + 5x + x2 = 0 + 0.375
5x + x2 = 0 + 0.375

Combine like terms: 0 + 0.375 = 0.375
5x + x2 = 0.375

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 0.375 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 0.375 + 6.25

Combine like terms: 0.375 + 6.25 = 6.625
6.25 + 5x + x2 = 6.625

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 6.625

Calculate the square root of the right side: 2.573907535

Break this problem into two subproblems by setting 
(x + 2.5) equal to 2.573907535 and -2.573907535.

Subproblem 1

x + 2.5 = 2.573907535 Simplifying x + 2.5 = 2.573907535 Reorder the terms: 2.5 + x = 2.573907535 Solving 2.5 + x = 2.573907535 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 2.573907535 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 2.573907535 + -2.5 x = 2.573907535 + -2.5 Combine like terms: 2.573907535 + -2.5 = 0.073907535 x = 0.073907535 Simplifying x = 0.073907535

Subproblem 2

x + 2.5 = -2.573907535 Simplifying x + 2.5 = -2.573907535 Reorder the terms: 2.5 + x = -2.573907535 Solving 2.5 + x = -2.573907535 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -2.573907535 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -2.573907535 + -2.5 x = -2.573907535 + -2.5 Combine like terms: -2.573907535 + -2.5 = -5.073907535 x = -5.073907535 Simplifying x = -5.073907535

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.073907535, -5.073907535}

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