5x^2+18x-12=0

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


Simplifying
5x2 + 18x + -12 = 0

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

Solving
-12 + 18x + 5x2 = 0

Solving for variable 'x'.

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 = 0.574868417 x = 0.574868417 Simplifying x = 0.574868417

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 = -4.174868417 x = -4.174868417 Simplifying x = -4.174868417

Solution

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

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