0.4x(6x+12)=1.1-(x+2)

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Solution for 0.4x(6x+12)=1.1-(x+2) equation:


Simplifying
0.4x(6x + 12) = 1.1 + -1(x + 2)

Reorder the terms:
0.4x(12 + 6x) = 1.1 + -1(x + 2)
(12 * 0.4x + 6x * 0.4x) = 1.1 + -1(x + 2)
(4.8x + 2.4x2) = 1.1 + -1(x + 2)

Reorder the terms:
4.8x + 2.4x2 = 1.1 + -1(2 + x)
4.8x + 2.4x2 = 1.1 + (2 * -1 + x * -1)
4.8x + 2.4x2 = 1.1 + (-2 + -1x)

Combine like terms: 1.1 + -2 = -0.9
4.8x + 2.4x2 = -0.9 + -1x

Solving
4.8x + 2.4x2 = -0.9 + -1x

Solving for variable 'x'.

Reorder the terms:
0.9 + 4.8x + x + 2.4x2 = -0.9 + -1x + 0.9 + x

Combine like terms: 4.8x + x = 5.8x
0.9 + 5.8x + 2.4x2 = -0.9 + -1x + 0.9 + x

Reorder the terms:
0.9 + 5.8x + 2.4x2 = -0.9 + 0.9 + -1x + x

Combine like terms: -0.9 + 0.9 = 0.0
0.9 + 5.8x + 2.4x2 = 0.0 + -1x + x
0.9 + 5.8x + 2.4x2 = -1x + x

Combine like terms: -1x + x = 0
0.9 + 5.8x + 2.4x2 = 0

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

Divide each side by '2.4'.
0.375 + 2.416666667x + x2 = 0

Move the constant term to the right:

Add '-0.375' to each side of the equation.
0.375 + 2.416666667x + -0.375 + x2 = 0 + -0.375

Reorder the terms:
0.375 + -0.375 + 2.416666667x + x2 = 0 + -0.375

Combine like terms: 0.375 + -0.375 = 0.000
0.000 + 2.416666667x + x2 = 0 + -0.375
2.416666667x + x2 = 0 + -0.375

Combine like terms: 0 + -0.375 = -0.375
2.416666667x + x2 = -0.375

The x term is 2.416666667x.  Take half its coefficient (1.208333334).
Square it (1.460069446) and add it to both sides.

Add '1.460069446' to each side of the equation.
2.416666667x + 1.460069446 + x2 = -0.375 + 1.460069446

Reorder the terms:
1.460069446 + 2.416666667x + x2 = -0.375 + 1.460069446

Combine like terms: -0.375 + 1.460069446 = 1.085069446
1.460069446 + 2.416666667x + x2 = 1.085069446

Factor a perfect square on the left side:
(x + 1.208333334)(x + 1.208333334) = 1.085069446

Calculate the square root of the right side: 1.041666667

Break this problem into two subproblems by setting 
(x + 1.208333334) equal to 1.041666667 and -1.041666667.

Subproblem 1

x + 1.208333334 = 1.041666667 Simplifying x + 1.208333334 = 1.041666667 Reorder the terms: 1.208333334 + x = 1.041666667 Solving 1.208333334 + x = 1.041666667 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.208333334' to each side of the equation. 1.208333334 + -1.208333334 + x = 1.041666667 + -1.208333334 Combine like terms: 1.208333334 + -1.208333334 = 0.000000000 0.000000000 + x = 1.041666667 + -1.208333334 x = 1.041666667 + -1.208333334 Combine like terms: 1.041666667 + -1.208333334 = -0.166666667 x = -0.166666667 Simplifying x = -0.166666667

Subproblem 2

x + 1.208333334 = -1.041666667 Simplifying x + 1.208333334 = -1.041666667 Reorder the terms: 1.208333334 + x = -1.041666667 Solving 1.208333334 + x = -1.041666667 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.208333334' to each side of the equation. 1.208333334 + -1.208333334 + x = -1.041666667 + -1.208333334 Combine like terms: 1.208333334 + -1.208333334 = 0.000000000 0.000000000 + x = -1.041666667 + -1.208333334 x = -1.041666667 + -1.208333334 Combine like terms: -1.041666667 + -1.208333334 = -2.250000001 x = -2.250000001 Simplifying x = -2.250000001

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.166666667, -2.250000001}

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