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

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


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

Reorder the terms:
4 + 3x = 4x(x + -4)

Reorder the terms:
4 + 3x = 4x(-4 + x)
4 + 3x = (-4 * 4x + x * 4x)
4 + 3x = (-16x + 4x2)

Solving
4 + 3x = -16x + 4x2

Solving for variable 'x'.

Combine like terms: 3x + 16x = 19x
4 + 19x + -4x2 = -16x + 4x2 + 16x + -4x2

Reorder the terms:
4 + 19x + -4x2 = -16x + 16x + 4x2 + -4x2

Combine like terms: -16x + 16x = 0
4 + 19x + -4x2 = 0 + 4x2 + -4x2
4 + 19x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
4 + 19x + -4x2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-1 + -4.75x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -4.75x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + -4.75x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -4.75x + x2 = 0 + 1
-4.75x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-4.75x + x2 = 1

The x term is -4.75x.  Take half its coefficient (-2.375).
Square it (5.640625) and add it to both sides.

Add '5.640625' to each side of the equation.
-4.75x + 5.640625 + x2 = 1 + 5.640625

Reorder the terms:
5.640625 + -4.75x + x2 = 1 + 5.640625

Combine like terms: 1 + 5.640625 = 6.640625
5.640625 + -4.75x + x2 = 6.640625

Factor a perfect square on the left side:
(x + -2.375)(x + -2.375) = 6.640625

Calculate the square root of the right side: 2.576941016

Break this problem into two subproblems by setting 
(x + -2.375) equal to 2.576941016 and -2.576941016.

Subproblem 1

x + -2.375 = 2.576941016 Simplifying x + -2.375 = 2.576941016 Reorder the terms: -2.375 + x = 2.576941016 Solving -2.375 + x = 2.576941016 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.375' to each side of the equation. -2.375 + 2.375 + x = 2.576941016 + 2.375 Combine like terms: -2.375 + 2.375 = 0.000 0.000 + x = 2.576941016 + 2.375 x = 2.576941016 + 2.375 Combine like terms: 2.576941016 + 2.375 = 4.951941016 x = 4.951941016 Simplifying x = 4.951941016

Subproblem 2

x + -2.375 = -2.576941016 Simplifying x + -2.375 = -2.576941016 Reorder the terms: -2.375 + x = -2.576941016 Solving -2.375 + x = -2.576941016 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.375' to each side of the equation. -2.375 + 2.375 + x = -2.576941016 + 2.375 Combine like terms: -2.375 + 2.375 = 0.000 0.000 + x = -2.576941016 + 2.375 x = -2.576941016 + 2.375 Combine like terms: -2.576941016 + 2.375 = -0.201941016 x = -0.201941016 Simplifying x = -0.201941016

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.951941016, -0.201941016}

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