-4x^2-12x=-5

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Solution for -4x^2-12x=-5 equation:


Simplifying
-4x2 + -12x = -5

Reorder the terms:
-12x + -4x2 = -5

Solving
-12x + -4x2 = -5

Solving for variable 'x'.

Reorder the terms:
5 + -12x + -4x2 = -5 + 5

Combine like terms: -5 + 5 = 0
5 + -12x + -4x2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-1.25 + 3x + x2 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + 3x + 1.25 + x2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + 3x + x2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + 3x + x2 = 0 + 1.25
3x + x2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
3x + x2 = 1.25

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 1.25 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 1.25 + 2.25

Combine like terms: 1.25 + 2.25 = 3.5
2.25 + 3x + x2 = 3.5

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 3.5

Calculate the square root of the right side: 1.870828693

Break this problem into two subproblems by setting 
(x + 1.5) equal to 1.870828693 and -1.870828693.

Subproblem 1

x + 1.5 = 1.870828693 Simplifying x + 1.5 = 1.870828693 Reorder the terms: 1.5 + x = 1.870828693 Solving 1.5 + x = 1.870828693 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 1.870828693 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 1.870828693 + -1.5 x = 1.870828693 + -1.5 Combine like terms: 1.870828693 + -1.5 = 0.370828693 x = 0.370828693 Simplifying x = 0.370828693

Subproblem 2

x + 1.5 = -1.870828693 Simplifying x + 1.5 = -1.870828693 Reorder the terms: 1.5 + x = -1.870828693 Solving 1.5 + x = -1.870828693 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -1.870828693 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -1.870828693 + -1.5 x = -1.870828693 + -1.5 Combine like terms: -1.870828693 + -1.5 = -3.370828693 x = -3.370828693 Simplifying x = -3.370828693

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.370828693, -3.370828693}

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