x(5x+12)=12

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Solution for x(5x+12)=12 equation:


Simplifying
x(5x + 12) = 12

Reorder the terms:
x(12 + 5x) = 12
(12 * x + 5x * x) = 12
(12x + 5x2) = 12

Solving
12x + 5x2 = 12

Solving for variable 'x'.

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

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

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

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

Move the constant term to the right:

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

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

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

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

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 = 2.4 + 1.44

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

Combine like terms: 2.4 + 1.44 = 3.84
1.44 + 2.4x + x2 = 3.84

Factor a perfect square on the left side:
(x + 1.2)(x + 1.2) = 3.84

Calculate the square root of the right side: 1.959591794

Break this problem into two subproblems by setting 
(x + 1.2) equal to 1.959591794 and -1.959591794.

Subproblem 1

x + 1.2 = 1.959591794 Simplifying x + 1.2 = 1.959591794 Reorder the terms: 1.2 + x = 1.959591794 Solving 1.2 + x = 1.959591794 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 = 1.959591794 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = 1.959591794 + -1.2 x = 1.959591794 + -1.2 Combine like terms: 1.959591794 + -1.2 = 0.759591794 x = 0.759591794 Simplifying x = 0.759591794

Subproblem 2

x + 1.2 = -1.959591794 Simplifying x + 1.2 = -1.959591794 Reorder the terms: 1.2 + x = -1.959591794 Solving 1.2 + x = -1.959591794 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 = -1.959591794 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = -1.959591794 + -1.2 x = -1.959591794 + -1.2 Combine like terms: -1.959591794 + -1.2 = -3.159591794 x = -3.159591794 Simplifying x = -3.159591794

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.759591794, -3.159591794}

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