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

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


Simplifying
3x(x + -4) = 4 + -1(4x + -5)

Reorder the terms:
3x(-4 + x) = 4 + -1(4x + -5)
(-4 * 3x + x * 3x) = 4 + -1(4x + -5)
(-12x + 3x2) = 4 + -1(4x + -5)

Reorder the terms:
-12x + 3x2 = 4 + -1(-5 + 4x)
-12x + 3x2 = 4 + (-5 * -1 + 4x * -1)
-12x + 3x2 = 4 + (5 + -4x)

Combine like terms: 4 + 5 = 9
-12x + 3x2 = 9 + -4x

Solving
-12x + 3x2 = 9 + -4x

Solving for variable 'x'.

Reorder the terms:
-9 + -12x + 4x + 3x2 = 9 + -4x + -9 + 4x

Combine like terms: -12x + 4x = -8x
-9 + -8x + 3x2 = 9 + -4x + -9 + 4x

Reorder the terms:
-9 + -8x + 3x2 = 9 + -9 + -4x + 4x

Combine like terms: 9 + -9 = 0
-9 + -8x + 3x2 = 0 + -4x + 4x
-9 + -8x + 3x2 = -4x + 4x

Combine like terms: -4x + 4x = 0
-9 + -8x + 3x2 = 0

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

Divide each side by '3'.
-3 + -2.666666667x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -2.666666667x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + -2.666666667x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -2.666666667x + x2 = 0 + 3
-2.666666667x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
-2.666666667x + x2 = 3

The x term is -2.666666667x.  Take half its coefficient (-1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
-2.666666667x + 1.777777780 + x2 = 3 + 1.777777780

Reorder the terms:
1.777777780 + -2.666666667x + x2 = 3 + 1.777777780

Combine like terms: 3 + 1.777777780 = 4.77777778
1.777777780 + -2.666666667x + x2 = 4.77777778

Factor a perfect square on the left side:
(x + -1.333333334)(x + -1.333333334) = 4.77777778

Calculate the square root of the right side: 2.185812842

Break this problem into two subproblems by setting 
(x + -1.333333334) equal to 2.185812842 and -2.185812842.

Subproblem 1

x + -1.333333334 = 2.185812842 Simplifying x + -1.333333334 = 2.185812842 Reorder the terms: -1.333333334 + x = 2.185812842 Solving -1.333333334 + x = 2.185812842 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.333333334' to each side of the equation. -1.333333334 + 1.333333334 + x = 2.185812842 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + x = 2.185812842 + 1.333333334 x = 2.185812842 + 1.333333334 Combine like terms: 2.185812842 + 1.333333334 = 3.519146176 x = 3.519146176 Simplifying x = 3.519146176

Subproblem 2

x + -1.333333334 = -2.185812842 Simplifying x + -1.333333334 = -2.185812842 Reorder the terms: -1.333333334 + x = -2.185812842 Solving -1.333333334 + x = -2.185812842 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.333333334' to each side of the equation. -1.333333334 + 1.333333334 + x = -2.185812842 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + x = -2.185812842 + 1.333333334 x = -2.185812842 + 1.333333334 Combine like terms: -2.185812842 + 1.333333334 = -0.852479508 x = -0.852479508 Simplifying x = -0.852479508

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.519146176, -0.852479508}

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