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

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Solution for (x-4)(4x+1)=x(3+1) equation:


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

Reorder the terms:
(-4 + x)(4x + 1) = x(3 + 1)

Reorder the terms:
(-4 + x)(1 + 4x) = x(3 + 1)

Multiply (-4 + x) * (1 + 4x)
(-4(1 + 4x) + x(1 + 4x)) = x(3 + 1)
((1 * -4 + 4x * -4) + x(1 + 4x)) = x(3 + 1)
((-4 + -16x) + x(1 + 4x)) = x(3 + 1)
(-4 + -16x + (1 * x + 4x * x)) = x(3 + 1)
(-4 + -16x + (1x + 4x2)) = x(3 + 1)

Combine like terms: -16x + 1x = -15x
(-4 + -15x + 4x2) = x(3 + 1)

Combine like terms: 3 + 1 = 4
-4 + -15x + 4x2 = x(4)

Reorder the terms for easier multiplication:
-4 + -15x + 4x2 = 4x

Solving
-4 + -15x + 4x2 = 4x

Solving for variable 'x'.

Reorder the terms:
-4 + -15x + -4x + 4x2 = 4x + -4x

Combine like terms: -15x + -4x = -19x
-4 + -19x + 4x2 = 4x + -4x

Combine like terms: 4x + -4x = 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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