-5x^2-12x=-8

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Solution for -5x^2-12x=-8 equation:


Simplifying
-5x2 + -12x = -8

Reorder the terms:
-12x + -5x2 = -8

Solving
-12x + -5x2 = -8

Solving for variable 'x'.

Reorder the terms:
8 + -12x + -5x2 = -8 + 8

Combine like terms: -8 + 8 = 0
8 + -12x + -5x2 = 0

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

Divide each side by '-5'.
-1.6 + 2.4x + x2 = 0

Move the constant term to the right:

Add '1.6' to each side of the equation.
-1.6 + 2.4x + 1.6 + x2 = 0 + 1.6

Reorder the terms:
-1.6 + 1.6 + 2.4x + x2 = 0 + 1.6

Combine like terms: -1.6 + 1.6 = 0.0
0.0 + 2.4x + x2 = 0 + 1.6
2.4x + x2 = 0 + 1.6

Combine like terms: 0 + 1.6 = 1.6
2.4x + x2 = 1.6

The x term is 2.4x.  Take half its coefficient (1.2).
Square it (1.44) and add it to both sides.

Add '1.44' to each side of the equation.
2.4x + 1.44 + x2 = 1.6 + 1.44

Reorder the terms:
1.44 + 2.4x + x2 = 1.6 + 1.44

Combine like terms: 1.6 + 1.44 = 3.04
1.44 + 2.4x + x2 = 3.04

Factor a perfect square on the left side:
(x + 1.2)(x + 1.2) = 3.04

Calculate the square root of the right side: 1.743559577

Break this problem into two subproblems by setting 
(x + 1.2) equal to 1.743559577 and -1.743559577.

Subproblem 1

x + 1.2 = 1.743559577 Simplifying x + 1.2 = 1.743559577 Reorder the terms: 1.2 + x = 1.743559577 Solving 1.2 + x = 1.743559577 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.2' to each side of the equation. 1.2 + -1.2 + x = 1.743559577 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = 1.743559577 + -1.2 x = 1.743559577 + -1.2 Combine like terms: 1.743559577 + -1.2 = 0.543559577 x = 0.543559577 Simplifying x = 0.543559577

Subproblem 2

x + 1.2 = -1.743559577 Simplifying x + 1.2 = -1.743559577 Reorder the terms: 1.2 + x = -1.743559577 Solving 1.2 + x = -1.743559577 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.2' to each side of the equation. 1.2 + -1.2 + x = -1.743559577 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = -1.743559577 + -1.2 x = -1.743559577 + -1.2 Combine like terms: -1.743559577 + -1.2 = -2.943559577 x = -2.943559577 Simplifying x = -2.943559577

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.543559577, -2.943559577}

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