18x^2+15x-22=0

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Solution for 18x^2+15x-22=0 equation:


Simplifying
18x2 + 15x + -22 = 0

Reorder the terms:
-22 + 15x + 18x2 = 0

Solving
-22 + 15x + 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'.
-1.222222222 + 0.8333333333x + x2 = 0

Move the constant term to the right:

Add '1.222222222' to each side of the equation.
-1.222222222 + 0.8333333333x + 1.222222222 + x2 = 0 + 1.222222222

Reorder the terms:
-1.222222222 + 1.222222222 + 0.8333333333x + x2 = 0 + 1.222222222

Combine like terms: -1.222222222 + 1.222222222 = 0.000000000
0.000000000 + 0.8333333333x + x2 = 0 + 1.222222222
0.8333333333x + x2 = 0 + 1.222222222

Combine like terms: 0 + 1.222222222 = 1.222222222
0.8333333333x + x2 = 1.222222222

The x term is 0.8333333333x.  Take half its coefficient (0.4166666667).
Square it (0.1736111111) and add it to both sides.

Add '0.1736111111' to each side of the equation.
0.8333333333x + 0.1736111111 + x2 = 1.222222222 + 0.1736111111

Reorder the terms:
0.1736111111 + 0.8333333333x + x2 = 1.222222222 + 0.1736111111

Combine like terms: 1.222222222 + 0.1736111111 = 1.3958333331
0.1736111111 + 0.8333333333x + x2 = 1.3958333331

Factor a perfect square on the left side:
(x + 0.4166666667)(x + 0.4166666667) = 1.3958333331

Calculate the square root of the right side: 1.181453906

Break this problem into two subproblems by setting 
(x + 0.4166666667) equal to 1.181453906 and -1.181453906.

Subproblem 1

x + 0.4166666667 = 1.181453906 Simplifying x + 0.4166666667 = 1.181453906 Reorder the terms: 0.4166666667 + x = 1.181453906 Solving 0.4166666667 + x = 1.181453906 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4166666667' to each side of the equation. 0.4166666667 + -0.4166666667 + x = 1.181453906 + -0.4166666667 Combine like terms: 0.4166666667 + -0.4166666667 = 0.0000000000 0.0000000000 + x = 1.181453906 + -0.4166666667 x = 1.181453906 + -0.4166666667 Combine like terms: 1.181453906 + -0.4166666667 = 0.7647872393 x = 0.7647872393 Simplifying x = 0.7647872393

Subproblem 2

x + 0.4166666667 = -1.181453906 Simplifying x + 0.4166666667 = -1.181453906 Reorder the terms: 0.4166666667 + x = -1.181453906 Solving 0.4166666667 + x = -1.181453906 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4166666667' to each side of the equation. 0.4166666667 + -0.4166666667 + x = -1.181453906 + -0.4166666667 Combine like terms: 0.4166666667 + -0.4166666667 = 0.0000000000 0.0000000000 + x = -1.181453906 + -0.4166666667 x = -1.181453906 + -0.4166666667 Combine like terms: -1.181453906 + -0.4166666667 = -1.5981205727 x = -1.5981205727 Simplifying x = -1.5981205727

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.7647872393, -1.5981205727}

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