5x(x-4)+3x=120-4x

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Solution for 5x(x-4)+3x=120-4x equation:


Simplifying
5x(x + -4) + 3x = 120 + -4x

Reorder the terms:
5x(-4 + x) + 3x = 120 + -4x
(-4 * 5x + x * 5x) + 3x = 120 + -4x
(-20x + 5x2) + 3x = 120 + -4x

Reorder the terms:
-20x + 3x + 5x2 = 120 + -4x

Combine like terms: -20x + 3x = -17x
-17x + 5x2 = 120 + -4x

Solving
-17x + 5x2 = 120 + -4x

Solving for variable 'x'.

Reorder the terms:
-120 + -17x + 4x + 5x2 = 120 + -4x + -120 + 4x

Combine like terms: -17x + 4x = -13x
-120 + -13x + 5x2 = 120 + -4x + -120 + 4x

Reorder the terms:
-120 + -13x + 5x2 = 120 + -120 + -4x + 4x

Combine like terms: 120 + -120 = 0
-120 + -13x + 5x2 = 0 + -4x + 4x
-120 + -13x + 5x2 = -4x + 4x

Combine like terms: -4x + 4x = 0
-120 + -13x + 5x2 = 0

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

Divide each side by '5'.
-24 + -2.6x + x2 = 0

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + -2.6x + 24 + x2 = 0 + 24

Reorder the terms:
-24 + 24 + -2.6x + x2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + -2.6x + x2 = 0 + 24
-2.6x + x2 = 0 + 24

Combine like terms: 0 + 24 = 24
-2.6x + x2 = 24

The x term is -2.6x.  Take half its coefficient (-1.3).
Square it (1.69) and add it to both sides.

Add '1.69' to each side of the equation.
-2.6x + 1.69 + x2 = 24 + 1.69

Reorder the terms:
1.69 + -2.6x + x2 = 24 + 1.69

Combine like terms: 24 + 1.69 = 25.69
1.69 + -2.6x + x2 = 25.69

Factor a perfect square on the left side:
(x + -1.3)(x + -1.3) = 25.69

Calculate the square root of the right side: 5.068530359

Break this problem into two subproblems by setting 
(x + -1.3) equal to 5.068530359 and -5.068530359.

Subproblem 1

x + -1.3 = 5.068530359 Simplifying x + -1.3 = 5.068530359 Reorder the terms: -1.3 + x = 5.068530359 Solving -1.3 + x = 5.068530359 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.3' to each side of the equation. -1.3 + 1.3 + x = 5.068530359 + 1.3 Combine like terms: -1.3 + 1.3 = 0.0 0.0 + x = 5.068530359 + 1.3 x = 5.068530359 + 1.3 Combine like terms: 5.068530359 + 1.3 = 6.368530359 x = 6.368530359 Simplifying x = 6.368530359

Subproblem 2

x + -1.3 = -5.068530359 Simplifying x + -1.3 = -5.068530359 Reorder the terms: -1.3 + x = -5.068530359 Solving -1.3 + x = -5.068530359 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.3' to each side of the equation. -1.3 + 1.3 + x = -5.068530359 + 1.3 Combine like terms: -1.3 + 1.3 = 0.0 0.0 + x = -5.068530359 + 1.3 x = -5.068530359 + 1.3 Combine like terms: -5.068530359 + 1.3 = -3.768530359 x = -3.768530359 Simplifying x = -3.768530359

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.368530359, -3.768530359}

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