5x^2-38x-8=0

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Solution for 5x^2-38x-8=0 equation:


Simplifying
5x2 + -38x + -8 = 0

Reorder the terms:
-8 + -38x + 5x2 = 0

Solving
-8 + -38x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-1.6 + -7.6x + x2 = 0

Move the constant term to the right:

Add '1.6' to each side of the equation.
-1.6 + -7.6x + 1.6 + x2 = 0 + 1.6

Reorder the terms:
-1.6 + 1.6 + -7.6x + x2 = 0 + 1.6

Combine like terms: -1.6 + 1.6 = 0.0
0.0 + -7.6x + x2 = 0 + 1.6
-7.6x + x2 = 0 + 1.6

Combine like terms: 0 + 1.6 = 1.6
-7.6x + x2 = 1.6

The x term is -7.6x.  Take half its coefficient (-3.8).
Square it (14.44) and add it to both sides.

Add '14.44' to each side of the equation.
-7.6x + 14.44 + x2 = 1.6 + 14.44

Reorder the terms:
14.44 + -7.6x + x2 = 1.6 + 14.44

Combine like terms: 1.6 + 14.44 = 16.04
14.44 + -7.6x + x2 = 16.04

Factor a perfect square on the left side:
(x + -3.8)(x + -3.8) = 16.04

Calculate the square root of the right side: 4.004996879

Break this problem into two subproblems by setting 
(x + -3.8) equal to 4.004996879 and -4.004996879.

Subproblem 1

x + -3.8 = 4.004996879 Simplifying x + -3.8 = 4.004996879 Reorder the terms: -3.8 + x = 4.004996879 Solving -3.8 + x = 4.004996879 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.8' to each side of the equation. -3.8 + 3.8 + x = 4.004996879 + 3.8 Combine like terms: -3.8 + 3.8 = 0.0 0.0 + x = 4.004996879 + 3.8 x = 4.004996879 + 3.8 Combine like terms: 4.004996879 + 3.8 = 7.804996879 x = 7.804996879 Simplifying x = 7.804996879

Subproblem 2

x + -3.8 = -4.004996879 Simplifying x + -3.8 = -4.004996879 Reorder the terms: -3.8 + x = -4.004996879 Solving -3.8 + x = -4.004996879 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.8' to each side of the equation. -3.8 + 3.8 + x = -4.004996879 + 3.8 Combine like terms: -3.8 + 3.8 = 0.0 0.0 + x = -4.004996879 + 3.8 x = -4.004996879 + 3.8 Combine like terms: -4.004996879 + 3.8 = -0.204996879 x = -0.204996879 Simplifying x = -0.204996879

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.804996879, -0.204996879}

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