0=5x^2-18x-12

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Solution for 0=5x^2-18x-12 equation:


Simplifying
0 = 5x2 + -18x + -12

Reorder the terms:
0 = -12 + -18x + 5x2

Solving
0 = -12 + -18x + 5x2

Solving for variable 'x'.

Combine like terms: 0 + 12 = 12
12 + 18x + -5x2 = -12 + -18x + 5x2 + 12 + 18x + -5x2

Reorder the terms:
12 + 18x + -5x2 = -12 + 12 + -18x + 18x + 5x2 + -5x2

Combine like terms: -12 + 12 = 0
12 + 18x + -5x2 = 0 + -18x + 18x + 5x2 + -5x2
12 + 18x + -5x2 = -18x + 18x + 5x2 + -5x2

Combine like terms: -18x + 18x = 0
12 + 18x + -5x2 = 0 + 5x2 + -5x2
12 + 18x + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
12 + 18x + -5x2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-2.4 + -3.6x + x2 = 0

Move the constant term to the right:

Add '2.4' to each side of the equation.
-2.4 + -3.6x + 2.4 + x2 = 0 + 2.4

Reorder the terms:
-2.4 + 2.4 + -3.6x + x2 = 0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + -3.6x + x2 = 0 + 2.4
-3.6x + x2 = 0 + 2.4

Combine like terms: 0 + 2.4 = 2.4
-3.6x + x2 = 2.4

The x term is -3.6x.  Take half its coefficient (-1.8).
Square it (3.24) and add it to both sides.

Add '3.24' to each side of the equation.
-3.6x + 3.24 + x2 = 2.4 + 3.24

Reorder the terms:
3.24 + -3.6x + x2 = 2.4 + 3.24

Combine like terms: 2.4 + 3.24 = 5.64
3.24 + -3.6x + x2 = 5.64

Factor a perfect square on the left side:
(x + -1.8)(x + -1.8) = 5.64

Calculate the square root of the right side: 2.374868417

Break this problem into two subproblems by setting 
(x + -1.8) equal to 2.374868417 and -2.374868417.

Subproblem 1

x + -1.8 = 2.374868417 Simplifying x + -1.8 = 2.374868417 Reorder the terms: -1.8 + x = 2.374868417 Solving -1.8 + x = 2.374868417 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + x = 2.374868417 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + x = 2.374868417 + 1.8 x = 2.374868417 + 1.8 Combine like terms: 2.374868417 + 1.8 = 4.174868417 x = 4.174868417 Simplifying x = 4.174868417

Subproblem 2

x + -1.8 = -2.374868417 Simplifying x + -1.8 = -2.374868417 Reorder the terms: -1.8 + x = -2.374868417 Solving -1.8 + x = -2.374868417 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + x = -2.374868417 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + x = -2.374868417 + 1.8 x = -2.374868417 + 1.8 Combine like terms: -2.374868417 + 1.8 = -0.574868417 x = -0.574868417 Simplifying x = -0.574868417

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.174868417, -0.574868417}

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