3x(x+4)-6=5x+5+5

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Solution for 3x(x+4)-6=5x+5+5 equation:


Simplifying
3x(x + 4) + -6 = 5x + 5 + 5

Reorder the terms:
3x(4 + x) + -6 = 5x + 5 + 5
(4 * 3x + x * 3x) + -6 = 5x + 5 + 5
(12x + 3x2) + -6 = 5x + 5 + 5

Reorder the terms:
-6 + 12x + 3x2 = 5x + 5 + 5

Reorder the terms:
-6 + 12x + 3x2 = 5 + 5 + 5x

Combine like terms: 5 + 5 = 10
-6 + 12x + 3x2 = 10 + 5x

Solving
-6 + 12x + 3x2 = 10 + 5x

Solving for variable 'x'.

Reorder the terms:
-6 + -10 + 12x + -5x + 3x2 = 10 + 5x + -10 + -5x

Combine like terms: -6 + -10 = -16
-16 + 12x + -5x + 3x2 = 10 + 5x + -10 + -5x

Combine like terms: 12x + -5x = 7x
-16 + 7x + 3x2 = 10 + 5x + -10 + -5x

Reorder the terms:
-16 + 7x + 3x2 = 10 + -10 + 5x + -5x

Combine like terms: 10 + -10 = 0
-16 + 7x + 3x2 = 0 + 5x + -5x
-16 + 7x + 3x2 = 5x + -5x

Combine like terms: 5x + -5x = 0
-16 + 7x + 3x2 = 0

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

Divide each side by '3'.
-5.333333333 + 2.333333333x + x2 = 0

Move the constant term to the right:

Add '5.333333333' to each side of the equation.
-5.333333333 + 2.333333333x + 5.333333333 + x2 = 0 + 5.333333333

Reorder the terms:
-5.333333333 + 5.333333333 + 2.333333333x + x2 = 0 + 5.333333333

Combine like terms: -5.333333333 + 5.333333333 = 0.000000000
0.000000000 + 2.333333333x + x2 = 0 + 5.333333333
2.333333333x + x2 = 0 + 5.333333333

Combine like terms: 0 + 5.333333333 = 5.333333333
2.333333333x + x2 = 5.333333333

The x term is 2.333333333x.  Take half its coefficient (1.166666667).
Square it (1.361111112) and add it to both sides.

Add '1.361111112' to each side of the equation.
2.333333333x + 1.361111112 + x2 = 5.333333333 + 1.361111112

Reorder the terms:
1.361111112 + 2.333333333x + x2 = 5.333333333 + 1.361111112

Combine like terms: 5.333333333 + 1.361111112 = 6.694444445
1.361111112 + 2.333333333x + x2 = 6.694444445

Factor a perfect square on the left side:
(x + 1.166666667)(x + 1.166666667) = 6.694444445

Calculate the square root of the right side: 2.587362449

Break this problem into two subproblems by setting 
(x + 1.166666667) equal to 2.587362449 and -2.587362449.

Subproblem 1

x + 1.166666667 = 2.587362449 Simplifying x + 1.166666667 = 2.587362449 Reorder the terms: 1.166666667 + x = 2.587362449 Solving 1.166666667 + x = 2.587362449 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.166666667' to each side of the equation. 1.166666667 + -1.166666667 + x = 2.587362449 + -1.166666667 Combine like terms: 1.166666667 + -1.166666667 = 0.000000000 0.000000000 + x = 2.587362449 + -1.166666667 x = 2.587362449 + -1.166666667 Combine like terms: 2.587362449 + -1.166666667 = 1.420695782 x = 1.420695782 Simplifying x = 1.420695782

Subproblem 2

x + 1.166666667 = -2.587362449 Simplifying x + 1.166666667 = -2.587362449 Reorder the terms: 1.166666667 + x = -2.587362449 Solving 1.166666667 + x = -2.587362449 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.166666667' to each side of the equation. 1.166666667 + -1.166666667 + x = -2.587362449 + -1.166666667 Combine like terms: 1.166666667 + -1.166666667 = 0.000000000 0.000000000 + x = -2.587362449 + -1.166666667 x = -2.587362449 + -1.166666667 Combine like terms: -2.587362449 + -1.166666667 = -3.754029116 x = -3.754029116 Simplifying x = -3.754029116

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.420695782, -3.754029116}

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