8x^2+35x-2=0

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


Simplifying
8x2 + 35x + -2 = 0

Reorder the terms:
-2 + 35x + 8x2 = 0

Solving
-2 + 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'.
-0.25 + 4.375x + x2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + 4.375x + 0.25 + x2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + 4.375x + x2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + 4.375x + x2 = 0 + 0.25
4.375x + x2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
4.375x + x2 = 0.25

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 = 0.25 + 4.78515625

Reorder the terms:
4.78515625 + 4.375x + x2 = 0.25 + 4.78515625

Combine like terms: 0.25 + 4.78515625 = 5.03515625
4.78515625 + 4.375x + x2 = 5.03515625

Factor a perfect square on the left side:
(x + 2.1875)(x + 2.1875) = 5.03515625

Calculate the square root of the right side: 2.243915384

Break this problem into two subproblems by setting 
(x + 2.1875) equal to 2.243915384 and -2.243915384.

Subproblem 1

x + 2.1875 = 2.243915384 Simplifying x + 2.1875 = 2.243915384 Reorder the terms: 2.1875 + x = 2.243915384 Solving 2.1875 + x = 2.243915384 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 = 2.243915384 + -2.1875 Combine like terms: 2.1875 + -2.1875 = 0.0000 0.0000 + x = 2.243915384 + -2.1875 x = 2.243915384 + -2.1875 Combine like terms: 2.243915384 + -2.1875 = 0.056415384 x = 0.056415384 Simplifying x = 0.056415384

Subproblem 2

x + 2.1875 = -2.243915384 Simplifying x + 2.1875 = -2.243915384 Reorder the terms: 2.1875 + x = -2.243915384 Solving 2.1875 + x = -2.243915384 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 = -2.243915384 + -2.1875 Combine like terms: 2.1875 + -2.1875 = 0.0000 0.0000 + x = -2.243915384 + -2.1875 x = -2.243915384 + -2.1875 Combine like terms: -2.243915384 + -2.1875 = -4.431415384 x = -4.431415384 Simplifying x = -4.431415384

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.056415384, -4.431415384}

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