5x(x-4)=24

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Solution for 5x(x-4)=24 equation:


Simplifying
5x(x + -4) = 24

Reorder the terms:
5x(-4 + x) = 24
(-4 * 5x + x * 5x) = 24
(-20x + 5x2) = 24

Solving
-20x + 5x2 = 24

Solving for variable 'x'.

Reorder the terms:
-24 + -20x + 5x2 = 24 + -24

Combine like terms: 24 + -24 = 0
-24 + -20x + 5x2 = 0

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

Divide each side by '5'.
-4.8 + -4x + x2 = 0

Move the constant term to the right:

Add '4.8' to each side of the equation.
-4.8 + -4x + 4.8 + x2 = 0 + 4.8

Reorder the terms:
-4.8 + 4.8 + -4x + x2 = 0 + 4.8

Combine like terms: -4.8 + 4.8 = 0.0
0.0 + -4x + x2 = 0 + 4.8
-4x + x2 = 0 + 4.8

Combine like terms: 0 + 4.8 = 4.8
-4x + x2 = 4.8

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 4.8 + 4

Reorder the terms:
4 + -4x + x2 = 4.8 + 4

Combine like terms: 4.8 + 4 = 8.8
4 + -4x + x2 = 8.8

Factor a perfect square on the left side:
(x + -2)(x + -2) = 8.8

Calculate the square root of the right side: 2.966479395

Break this problem into two subproblems by setting 
(x + -2) equal to 2.966479395 and -2.966479395.

Subproblem 1

x + -2 = 2.966479395 Simplifying x + -2 = 2.966479395 Reorder the terms: -2 + x = 2.966479395 Solving -2 + x = 2.966479395 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 2.966479395 + 2 Combine like terms: -2 + 2 = 0 0 + x = 2.966479395 + 2 x = 2.966479395 + 2 Combine like terms: 2.966479395 + 2 = 4.966479395 x = 4.966479395 Simplifying x = 4.966479395

Subproblem 2

x + -2 = -2.966479395 Simplifying x + -2 = -2.966479395 Reorder the terms: -2 + x = -2.966479395 Solving -2 + x = -2.966479395 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -2.966479395 + 2 Combine like terms: -2 + 2 = 0 0 + x = -2.966479395 + 2 x = -2.966479395 + 2 Combine like terms: -2.966479395 + 2 = -0.966479395 x = -0.966479395 Simplifying x = -0.966479395

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.966479395, -0.966479395}

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