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

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


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

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

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

Solving
-20x + 5x2 = 4 + 3x

Solving for variable 'x'.

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

Combine like terms: -20x + -3x = -23x
-4 + -23x + 5x2 = 4 + 3x + -4 + -3x

Reorder the terms:
-4 + -23x + 5x2 = 4 + -4 + 3x + -3x

Combine like terms: 4 + -4 = 0
-4 + -23x + 5x2 = 0 + 3x + -3x
-4 + -23x + 5x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
-4 + -23x + 5x2 = 0

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

Divide each side by '5'.
-0.8 + -4.6x + x2 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + -4.6x + 0.8 + x2 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + -4.6x + x2 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + -4.6x + x2 = 0 + 0.8
-4.6x + x2 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
-4.6x + x2 = 0.8

The x term is -4.6x.  Take half its coefficient (-2.3).
Square it (5.29) and add it to both sides.

Add '5.29' to each side of the equation.
-4.6x + 5.29 + x2 = 0.8 + 5.29

Reorder the terms:
5.29 + -4.6x + x2 = 0.8 + 5.29

Combine like terms: 0.8 + 5.29 = 6.09
5.29 + -4.6x + x2 = 6.09

Factor a perfect square on the left side:
(x + -2.3)(x + -2.3) = 6.09

Calculate the square root of the right side: 2.467792536

Break this problem into two subproblems by setting 
(x + -2.3) equal to 2.467792536 and -2.467792536.

Subproblem 1

x + -2.3 = 2.467792536 Simplifying x + -2.3 = 2.467792536 Reorder the terms: -2.3 + x = 2.467792536 Solving -2.3 + x = 2.467792536 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.3' to each side of the equation. -2.3 + 2.3 + x = 2.467792536 + 2.3 Combine like terms: -2.3 + 2.3 = 0.0 0.0 + x = 2.467792536 + 2.3 x = 2.467792536 + 2.3 Combine like terms: 2.467792536 + 2.3 = 4.767792536 x = 4.767792536 Simplifying x = 4.767792536

Subproblem 2

x + -2.3 = -2.467792536 Simplifying x + -2.3 = -2.467792536 Reorder the terms: -2.3 + x = -2.467792536 Solving -2.3 + x = -2.467792536 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.3' to each side of the equation. -2.3 + 2.3 + x = -2.467792536 + 2.3 Combine like terms: -2.3 + 2.3 = 0.0 0.0 + x = -2.467792536 + 2.3 x = -2.467792536 + 2.3 Combine like terms: -2.467792536 + 2.3 = -0.167792536 x = -0.167792536 Simplifying x = -0.167792536

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.767792536, -0.167792536}

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