8x^2-35x-4=0

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Solution for 8x^2-35x-4=0 equation:


Simplifying
8x2 + -35x + -4 = 0

Reorder the terms:
-4 + -35x + 8x2 = 0

Solving
-4 + -35x + 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'.
-0.5 + -4.375x + x2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + -4.375x + 0.5 + x2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + -4.375x + x2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + -4.375x + x2 = 0 + 0.5
-4.375x + x2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
-4.375x + x2 = 0.5

The x term is -4.375x.  Take half its coefficient (-2.1875).
Square it (4.78515625) and add it to both sides.

Add '4.78515625' to each side of the equation.
-4.375x + 4.78515625 + x2 = 0.5 + 4.78515625

Reorder the terms:
4.78515625 + -4.375x + x2 = 0.5 + 4.78515625

Combine like terms: 0.5 + 4.78515625 = 5.28515625
4.78515625 + -4.375x + x2 = 5.28515625

Factor a perfect square on the left side:
(x + -2.1875)(x + -2.1875) = 5.28515625

Calculate the square root of the right side: 2.29894677

Break this problem into two subproblems by setting 
(x + -2.1875) equal to 2.29894677 and -2.29894677.

Subproblem 1

x + -2.1875 = 2.29894677 Simplifying x + -2.1875 = 2.29894677 Reorder the terms: -2.1875 + x = 2.29894677 Solving -2.1875 + x = 2.29894677 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.1875' to each side of the equation. -2.1875 + 2.1875 + x = 2.29894677 + 2.1875 Combine like terms: -2.1875 + 2.1875 = 0.0000 0.0000 + x = 2.29894677 + 2.1875 x = 2.29894677 + 2.1875 Combine like terms: 2.29894677 + 2.1875 = 4.48644677 x = 4.48644677 Simplifying x = 4.48644677

Subproblem 2

x + -2.1875 = -2.29894677 Simplifying x + -2.1875 = -2.29894677 Reorder the terms: -2.1875 + x = -2.29894677 Solving -2.1875 + x = -2.29894677 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.1875' to each side of the equation. -2.1875 + 2.1875 + x = -2.29894677 + 2.1875 Combine like terms: -2.1875 + 2.1875 = 0.0000 0.0000 + x = -2.29894677 + 2.1875 x = -2.29894677 + 2.1875 Combine like terms: -2.29894677 + 2.1875 = -0.11144677 x = -0.11144677 Simplifying x = -0.11144677

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.48644677, -0.11144677}

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