8x^2-11x-3=0

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Solution for 8x^2-11x-3=0 equation:


Simplifying
8x2 + -11x + -3 = 0

Reorder the terms:
-3 + -11x + 8x2 = 0

Solving
-3 + -11x + 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'.
-0.375 + -1.375x + x2 = 0

Move the constant term to the right:

Add '0.375' to each side of the equation.
-0.375 + -1.375x + 0.375 + x2 = 0 + 0.375

Reorder the terms:
-0.375 + 0.375 + -1.375x + x2 = 0 + 0.375

Combine like terms: -0.375 + 0.375 = 0.000
0.000 + -1.375x + x2 = 0 + 0.375
-1.375x + x2 = 0 + 0.375

Combine like terms: 0 + 0.375 = 0.375
-1.375x + x2 = 0.375

The x term is -1.375x.  Take half its coefficient (-0.6875).
Square it (0.47265625) and add it to both sides.

Add '0.47265625' to each side of the equation.
-1.375x + 0.47265625 + x2 = 0.375 + 0.47265625

Reorder the terms:
0.47265625 + -1.375x + x2 = 0.375 + 0.47265625

Combine like terms: 0.375 + 0.47265625 = 0.84765625
0.47265625 + -1.375x + x2 = 0.84765625

Factor a perfect square on the left side:
(x + -0.6875)(x + -0.6875) = 0.84765625

Calculate the square root of the right side: 0.920682491

Break this problem into two subproblems by setting 
(x + -0.6875) equal to 0.920682491 and -0.920682491.

Subproblem 1

x + -0.6875 = 0.920682491 Simplifying x + -0.6875 = 0.920682491 Reorder the terms: -0.6875 + x = 0.920682491 Solving -0.6875 + x = 0.920682491 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6875' to each side of the equation. -0.6875 + 0.6875 + x = 0.920682491 + 0.6875 Combine like terms: -0.6875 + 0.6875 = 0.0000 0.0000 + x = 0.920682491 + 0.6875 x = 0.920682491 + 0.6875 Combine like terms: 0.920682491 + 0.6875 = 1.608182491 x = 1.608182491 Simplifying x = 1.608182491

Subproblem 2

x + -0.6875 = -0.920682491 Simplifying x + -0.6875 = -0.920682491 Reorder the terms: -0.6875 + x = -0.920682491 Solving -0.6875 + x = -0.920682491 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6875' to each side of the equation. -0.6875 + 0.6875 + x = -0.920682491 + 0.6875 Combine like terms: -0.6875 + 0.6875 = 0.0000 0.0000 + x = -0.920682491 + 0.6875 x = -0.920682491 + 0.6875 Combine like terms: -0.920682491 + 0.6875 = -0.233182491 x = -0.233182491 Simplifying x = -0.233182491

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.608182491, -0.233182491}

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