18x^2+13x-41=0

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Solution for 18x^2+13x-41=0 equation:


Simplifying
18x2 + 13x + -41 = 0

Reorder the terms:
-41 + 13x + 18x2 = 0

Solving
-41 + 13x + 18x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
18 the coefficient of the squared term: 

Divide each side by '18'.
-2.277777778 + 0.7222222222x + x2 = 0

Move the constant term to the right:

Add '2.277777778' to each side of the equation.
-2.277777778 + 0.7222222222x + 2.277777778 + x2 = 0 + 2.277777778

Reorder the terms:
-2.277777778 + 2.277777778 + 0.7222222222x + x2 = 0 + 2.277777778

Combine like terms: -2.277777778 + 2.277777778 = 0.000000000
0.000000000 + 0.7222222222x + x2 = 0 + 2.277777778
0.7222222222x + x2 = 0 + 2.277777778

Combine like terms: 0 + 2.277777778 = 2.277777778
0.7222222222x + x2 = 2.277777778

The x term is 0.7222222222x.  Take half its coefficient (0.3611111111).
Square it (0.1304012346) and add it to both sides.

Add '0.1304012346' to each side of the equation.
0.7222222222x + 0.1304012346 + x2 = 2.277777778 + 0.1304012346

Reorder the terms:
0.1304012346 + 0.7222222222x + x2 = 2.277777778 + 0.1304012346

Combine like terms: 2.277777778 + 0.1304012346 = 2.4081790126
0.1304012346 + 0.7222222222x + x2 = 2.4081790126

Factor a perfect square on the left side:
(x + 0.3611111111)(x + 0.3611111111) = 2.4081790126

Calculate the square root of the right side: 1.551830858

Break this problem into two subproblems by setting 
(x + 0.3611111111) equal to 1.551830858 and -1.551830858.

Subproblem 1

x + 0.3611111111 = 1.551830858 Simplifying x + 0.3611111111 = 1.551830858 Reorder the terms: 0.3611111111 + x = 1.551830858 Solving 0.3611111111 + x = 1.551830858 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3611111111' to each side of the equation. 0.3611111111 + -0.3611111111 + x = 1.551830858 + -0.3611111111 Combine like terms: 0.3611111111 + -0.3611111111 = 0.0000000000 0.0000000000 + x = 1.551830858 + -0.3611111111 x = 1.551830858 + -0.3611111111 Combine like terms: 1.551830858 + -0.3611111111 = 1.1907197469 x = 1.1907197469 Simplifying x = 1.1907197469

Subproblem 2

x + 0.3611111111 = -1.551830858 Simplifying x + 0.3611111111 = -1.551830858 Reorder the terms: 0.3611111111 + x = -1.551830858 Solving 0.3611111111 + x = -1.551830858 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3611111111' to each side of the equation. 0.3611111111 + -0.3611111111 + x = -1.551830858 + -0.3611111111 Combine like terms: 0.3611111111 + -0.3611111111 = 0.0000000000 0.0000000000 + x = -1.551830858 + -0.3611111111 x = -1.551830858 + -0.3611111111 Combine like terms: -1.551830858 + -0.3611111111 = -1.9129419691 x = -1.9129419691 Simplifying x = -1.9129419691

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.1907197469, -1.9129419691}

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