8x^2-43x-18=0

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Solution for 8x^2-43x-18=0 equation:


Simplifying
8x2 + -43x + -18 = 0

Reorder the terms:
-18 + -43x + 8x2 = 0

Solving
-18 + -43x + 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'.
-2.25 + -5.375x + x2 = 0

Move the constant term to the right:

Add '2.25' to each side of the equation.
-2.25 + -5.375x + 2.25 + x2 = 0 + 2.25

Reorder the terms:
-2.25 + 2.25 + -5.375x + x2 = 0 + 2.25

Combine like terms: -2.25 + 2.25 = 0.00
0.00 + -5.375x + x2 = 0 + 2.25
-5.375x + x2 = 0 + 2.25

Combine like terms: 0 + 2.25 = 2.25
-5.375x + x2 = 2.25

The x term is -5.375x.  Take half its coefficient (-2.6875).
Square it (7.22265625) and add it to both sides.

Add '7.22265625' to each side of the equation.
-5.375x + 7.22265625 + x2 = 2.25 + 7.22265625

Reorder the terms:
7.22265625 + -5.375x + x2 = 2.25 + 7.22265625

Combine like terms: 2.25 + 7.22265625 = 9.47265625
7.22265625 + -5.375x + x2 = 9.47265625

Factor a perfect square on the left side:
(x + -2.6875)(x + -2.6875) = 9.47265625

Calculate the square root of the right side: 3.077768063

Break this problem into two subproblems by setting 
(x + -2.6875) equal to 3.077768063 and -3.077768063.

Subproblem 1

x + -2.6875 = 3.077768063 Simplifying x + -2.6875 = 3.077768063 Reorder the terms: -2.6875 + x = 3.077768063 Solving -2.6875 + x = 3.077768063 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.6875' to each side of the equation. -2.6875 + 2.6875 + x = 3.077768063 + 2.6875 Combine like terms: -2.6875 + 2.6875 = 0.0000 0.0000 + x = 3.077768063 + 2.6875 x = 3.077768063 + 2.6875 Combine like terms: 3.077768063 + 2.6875 = 5.765268063 x = 5.765268063 Simplifying x = 5.765268063

Subproblem 2

x + -2.6875 = -3.077768063 Simplifying x + -2.6875 = -3.077768063 Reorder the terms: -2.6875 + x = -3.077768063 Solving -2.6875 + x = -3.077768063 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.6875' to each side of the equation. -2.6875 + 2.6875 + x = -3.077768063 + 2.6875 Combine like terms: -2.6875 + 2.6875 = 0.0000 0.0000 + x = -3.077768063 + 2.6875 x = -3.077768063 + 2.6875 Combine like terms: -3.077768063 + 2.6875 = -0.390268063 x = -0.390268063 Simplifying x = -0.390268063

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.765268063, -0.390268063}

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