-12x(x+6.2)=60

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Solution for -12x(x+6.2)=60 equation:


Simplifying
-12x(x + 6.2) = 60

Reorder the terms:
-12x(6.2 + x) = 60
(6.2 * -12x + x * -12x) = 60
(-74.4x + -12x2) = 60

Solving
-74.4x + -12x2 = 60

Solving for variable 'x'.

Reorder the terms:
-60 + -74.4x + -12x2 = 60 + -60

Combine like terms: 60 + -60 = 0
-60 + -74.4x + -12x2 = 0

Begin completing the square.  Divide all terms by
-12 the coefficient of the squared term: 

Divide each side by '-12'.
5 + 6.2x + x2 = 0

Move the constant term to the right:

Add '-5' to each side of the equation.
5 + 6.2x + -5 + x2 = 0 + -5

Reorder the terms:
5 + -5 + 6.2x + x2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + 6.2x + x2 = 0 + -5
6.2x + x2 = 0 + -5

Combine like terms: 0 + -5 = -5
6.2x + x2 = -5

The x term is 6.2x.  Take half its coefficient (3.1).
Square it (9.61) and add it to both sides.

Add '9.61' to each side of the equation.
6.2x + 9.61 + x2 = -5 + 9.61

Reorder the terms:
9.61 + 6.2x + x2 = -5 + 9.61

Combine like terms: -5 + 9.61 = 4.61
9.61 + 6.2x + x2 = 4.61

Factor a perfect square on the left side:
(x + 3.1)(x + 3.1) = 4.61

Calculate the square root of the right side: 2.147091055

Break this problem into two subproblems by setting 
(x + 3.1) equal to 2.147091055 and -2.147091055.

Subproblem 1

x + 3.1 = 2.147091055 Simplifying x + 3.1 = 2.147091055 Reorder the terms: 3.1 + x = 2.147091055 Solving 3.1 + x = 2.147091055 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.1' to each side of the equation. 3.1 + -3.1 + x = 2.147091055 + -3.1 Combine like terms: 3.1 + -3.1 = 0.0 0.0 + x = 2.147091055 + -3.1 x = 2.147091055 + -3.1 Combine like terms: 2.147091055 + -3.1 = -0.952908945 x = -0.952908945 Simplifying x = -0.952908945

Subproblem 2

x + 3.1 = -2.147091055 Simplifying x + 3.1 = -2.147091055 Reorder the terms: 3.1 + x = -2.147091055 Solving 3.1 + x = -2.147091055 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.1' to each side of the equation. 3.1 + -3.1 + x = -2.147091055 + -3.1 Combine like terms: 3.1 + -3.1 = 0.0 0.0 + x = -2.147091055 + -3.1 x = -2.147091055 + -3.1 Combine like terms: -2.147091055 + -3.1 = -5.247091055 x = -5.247091055 Simplifying x = -5.247091055

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.952908945, -5.247091055}

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