8x^2+23x-18=0

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Solution for 8x^2+23x-18=0 equation:


Simplifying
8x2 + 23x + -18 = 0

Reorder the terms:
-18 + 23x + 8x2 = 0

Solving
-18 + 23x + 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 + 2.875x + x2 = 0

Move the constant term to the right:

Add '2.25' to each side of the equation.
-2.25 + 2.875x + 2.25 + x2 = 0 + 2.25

Reorder the terms:
-2.25 + 2.25 + 2.875x + x2 = 0 + 2.25

Combine like terms: -2.25 + 2.25 = 0.00
0.00 + 2.875x + x2 = 0 + 2.25
2.875x + x2 = 0 + 2.25

Combine like terms: 0 + 2.25 = 2.25
2.875x + x2 = 2.25

The x term is 2.875x.  Take half its coefficient (1.4375).
Square it (2.06640625) and add it to both sides.

Add '2.06640625' to each side of the equation.
2.875x + 2.06640625 + x2 = 2.25 + 2.06640625

Reorder the terms:
2.06640625 + 2.875x + x2 = 2.25 + 2.06640625

Combine like terms: 2.25 + 2.06640625 = 4.31640625
2.06640625 + 2.875x + x2 = 4.31640625

Factor a perfect square on the left side:
(x + 1.4375)(x + 1.4375) = 4.31640625

Calculate the square root of the right side: 2.077596267

Break this problem into two subproblems by setting 
(x + 1.4375) equal to 2.077596267 and -2.077596267.

Subproblem 1

x + 1.4375 = 2.077596267 Simplifying x + 1.4375 = 2.077596267 Reorder the terms: 1.4375 + x = 2.077596267 Solving 1.4375 + x = 2.077596267 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.4375' to each side of the equation. 1.4375 + -1.4375 + x = 2.077596267 + -1.4375 Combine like terms: 1.4375 + -1.4375 = 0.0000 0.0000 + x = 2.077596267 + -1.4375 x = 2.077596267 + -1.4375 Combine like terms: 2.077596267 + -1.4375 = 0.640096267 x = 0.640096267 Simplifying x = 0.640096267

Subproblem 2

x + 1.4375 = -2.077596267 Simplifying x + 1.4375 = -2.077596267 Reorder the terms: 1.4375 + x = -2.077596267 Solving 1.4375 + x = -2.077596267 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.4375' to each side of the equation. 1.4375 + -1.4375 + x = -2.077596267 + -1.4375 Combine like terms: 1.4375 + -1.4375 = 0.0000 0.0000 + x = -2.077596267 + -1.4375 x = -2.077596267 + -1.4375 Combine like terms: -2.077596267 + -1.4375 = -3.515096267 x = -3.515096267 Simplifying x = -3.515096267

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.640096267, -3.515096267}

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