8x^2-13x-35=0

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Solution for 8x^2-13x-35=0 equation:


Simplifying
8x2 + -13x + -35 = 0

Reorder the terms:
-35 + -13x + 8x2 = 0

Solving
-35 + -13x + 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'.
-4.375 + -1.625x + x2 = 0

Move the constant term to the right:

Add '4.375' to each side of the equation.
-4.375 + -1.625x + 4.375 + x2 = 0 + 4.375

Reorder the terms:
-4.375 + 4.375 + -1.625x + x2 = 0 + 4.375

Combine like terms: -4.375 + 4.375 = 0.000
0.000 + -1.625x + x2 = 0 + 4.375
-1.625x + x2 = 0 + 4.375

Combine like terms: 0 + 4.375 = 4.375
-1.625x + x2 = 4.375

The x term is -1.625x.  Take half its coefficient (-0.8125).
Square it (0.66015625) and add it to both sides.

Add '0.66015625' to each side of the equation.
-1.625x + 0.66015625 + x2 = 4.375 + 0.66015625

Reorder the terms:
0.66015625 + -1.625x + x2 = 4.375 + 0.66015625

Combine like terms: 4.375 + 0.66015625 = 5.03515625
0.66015625 + -1.625x + x2 = 5.03515625

Factor a perfect square on the left side:
(x + -0.8125)(x + -0.8125) = 5.03515625

Calculate the square root of the right side: 2.243915384

Break this problem into two subproblems by setting 
(x + -0.8125) equal to 2.243915384 and -2.243915384.

Subproblem 1

x + -0.8125 = 2.243915384 Simplifying x + -0.8125 = 2.243915384 Reorder the terms: -0.8125 + x = 2.243915384 Solving -0.8125 + x = 2.243915384 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8125' to each side of the equation. -0.8125 + 0.8125 + x = 2.243915384 + 0.8125 Combine like terms: -0.8125 + 0.8125 = 0.0000 0.0000 + x = 2.243915384 + 0.8125 x = 2.243915384 + 0.8125 Combine like terms: 2.243915384 + 0.8125 = 3.056415384 x = 3.056415384 Simplifying x = 3.056415384

Subproblem 2

x + -0.8125 = -2.243915384 Simplifying x + -0.8125 = -2.243915384 Reorder the terms: -0.8125 + x = -2.243915384 Solving -0.8125 + x = -2.243915384 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8125' to each side of the equation. -0.8125 + 0.8125 + x = -2.243915384 + 0.8125 Combine like terms: -0.8125 + 0.8125 = 0.0000 0.0000 + x = -2.243915384 + 0.8125 x = -2.243915384 + 0.8125 Combine like terms: -2.243915384 + 0.8125 = -1.431415384 x = -1.431415384 Simplifying x = -1.431415384

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.056415384, -1.431415384}

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