x^2-1.5x-18=0

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Solution for x^2-1.5x-18=0 equation: 


Simplifying
x2 + -1.5x + -18 = 0

Reorder the terms:
-18 + -1.5x + x2 = 0

Solving
-18 + -1.5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + -1.5x + 18 + x2 = 0 + 18

Reorder the terms:
-18 + 18 + -1.5x + x2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + -1.5x + x2 = 0 + 18
-1.5x + x2 = 0 + 18

Combine like terms: 0 + 18 = 18
-1.5x + x2 = 18

The x term is -1.5x.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5x + 0.5625 + x2 = 18 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 18 + 0.5625

Combine like terms: 18 + 0.5625 = 18.5625
0.5625 + -1.5x + x2 = 18.5625

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 18.5625

Calculate the square root of the right side: 4.308421985

Break this problem into two subproblems by setting 
(x + -0.75) equal to 4.308421985 and -4.308421985.


Subproblem 1
x + -0.75 = 4.308421985

Simplifying
x + -0.75 = 4.308421985

Reorder the terms:
-0.75 + x = 4.308421985

Solving
-0.75 + x = 4.308421985

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '0.75' to each side of the equation.
-0.75 + 0.75 + x = 4.308421985 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + x = 4.308421985 + 0.75
x = 4.308421985 + 0.75

Combine like terms: 4.308421985 + 0.75 = 5.058421985
x = 5.058421985

Simplifying
x = 5.058421985


Subproblem 2
x + -0.75 = -4.308421985

Simplifying
x + -0.75 = -4.308421985

Reorder the terms:
-0.75 + x = -4.308421985

Solving
-0.75 + x = -4.308421985

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '0.75' to each side of the equation.
-0.75 + 0.75 + x = -4.308421985 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + x = -4.308421985 + 0.75
x = -4.308421985 + 0.75

Combine like terms: -4.308421985 + 0.75 = -3.558421985
x = -3.558421985

Simplifying
x = -3.558421985


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {5.058421985, -3.558421985}

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