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

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


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

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

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

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

Solving for variable 'x'.

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

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

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

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

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

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

Divide each side by '4'.
-1.25 + -5.75x + x2 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + -5.75x + 1.25 + x2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + -5.75x + x2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + -5.75x + x2 = 0 + 1.25
-5.75x + x2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
-5.75x + x2 = 1.25

The x term is -5.75x.  Take half its coefficient (-2.875).
Square it (8.265625) and add it to both sides.

Add '8.265625' to each side of the equation.
-5.75x + 8.265625 + x2 = 1.25 + 8.265625

Reorder the terms:
8.265625 + -5.75x + x2 = 1.25 + 8.265625

Combine like terms: 1.25 + 8.265625 = 9.515625
8.265625 + -5.75x + x2 = 9.515625

Factor a perfect square on the left side:
(x + -2.875)(x + -2.875) = 9.515625

Calculate the square root of the right side: 3.08474067

Break this problem into two subproblems by setting 
(x + -2.875) equal to 3.08474067 and -3.08474067.

Subproblem 1

x + -2.875 = 3.08474067 Simplifying x + -2.875 = 3.08474067 Reorder the terms: -2.875 + x = 3.08474067 Solving -2.875 + x = 3.08474067 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.875' to each side of the equation. -2.875 + 2.875 + x = 3.08474067 + 2.875 Combine like terms: -2.875 + 2.875 = 0.000 0.000 + x = 3.08474067 + 2.875 x = 3.08474067 + 2.875 Combine like terms: 3.08474067 + 2.875 = 5.95974067 x = 5.95974067 Simplifying x = 5.95974067

Subproblem 2

x + -2.875 = -3.08474067 Simplifying x + -2.875 = -3.08474067 Reorder the terms: -2.875 + x = -3.08474067 Solving -2.875 + x = -3.08474067 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.875' to each side of the equation. -2.875 + 2.875 + x = -3.08474067 + 2.875 Combine like terms: -2.875 + 2.875 = 0.000 0.000 + x = -3.08474067 + 2.875 x = -3.08474067 + 2.875 Combine like terms: -3.08474067 + 2.875 = -0.20974067 x = -0.20974067 Simplifying x = -0.20974067

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.95974067, -0.20974067}

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