8x^2-35x-6=0

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Solution for 8x^2-35x-6=0 equation:


Simplifying
8x2 + -35x + -6 = 0

Reorder the terms:
-6 + -35x + 8x2 = 0

Solving
-6 + -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'.
-0.75 + -4.375x + x2 = 0

Move the constant term to the right:

Add '0.75' to each side of the equation.
-0.75 + -4.375x + 0.75 + x2 = 0 + 0.75

Reorder the terms:
-0.75 + 0.75 + -4.375x + x2 = 0 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + -4.375x + x2 = 0 + 0.75
-4.375x + x2 = 0 + 0.75

Combine like terms: 0 + 0.75 = 0.75
-4.375x + x2 = 0.75

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 = 0.75 + 4.78515625

Reorder the terms:
4.78515625 + -4.375x + x2 = 0.75 + 4.78515625

Combine like terms: 0.75 + 4.78515625 = 5.53515625
4.78515625 + -4.375x + x2 = 5.53515625

Factor a perfect square on the left side:
(x + -2.1875)(x + -2.1875) = 5.53515625

Calculate the square root of the right side: 2.352691278

Break this problem into two subproblems by setting 
(x + -2.1875) equal to 2.352691278 and -2.352691278.

Subproblem 1

x + -2.1875 = 2.352691278 Simplifying x + -2.1875 = 2.352691278 Reorder the terms: -2.1875 + x = 2.352691278 Solving -2.1875 + x = 2.352691278 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 = 2.352691278 + 2.1875 Combine like terms: -2.1875 + 2.1875 = 0.0000 0.0000 + x = 2.352691278 + 2.1875 x = 2.352691278 + 2.1875 Combine like terms: 2.352691278 + 2.1875 = 4.540191278 x = 4.540191278 Simplifying x = 4.540191278

Subproblem 2

x + -2.1875 = -2.352691278 Simplifying x + -2.1875 = -2.352691278 Reorder the terms: -2.1875 + x = -2.352691278 Solving -2.1875 + x = -2.352691278 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 = -2.352691278 + 2.1875 Combine like terms: -2.1875 + 2.1875 = 0.0000 0.0000 + x = -2.352691278 + 2.1875 x = -2.352691278 + 2.1875 Combine like terms: -2.352691278 + 2.1875 = -0.165191278 x = -0.165191278 Simplifying x = -0.165191278

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.540191278, -0.165191278}

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