5x(x-4)=12

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Solution for 5x(x-4)=12 equation:


Simplifying
5x(x + -4) = 12

Reorder the terms:
5x(-4 + x) = 12
(-4 * 5x + x * 5x) = 12
(-20x + 5x2) = 12

Solving
-20x + 5x2 = 12

Solving for variable 'x'.

Reorder the terms:
-12 + -20x + 5x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-12 + -20x + 5x2 = 0

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

Divide each side by '5'.
-2.4 + -4x + x2 = 0

Move the constant term to the right:

Add '2.4' to each side of the equation.
-2.4 + -4x + 2.4 + x2 = 0 + 2.4

Reorder the terms:
-2.4 + 2.4 + -4x + x2 = 0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + -4x + x2 = 0 + 2.4
-4x + x2 = 0 + 2.4

Combine like terms: 0 + 2.4 = 2.4
-4x + x2 = 2.4

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 = 2.4 + 4

Reorder the terms:
4 + -4x + x2 = 2.4 + 4

Combine like terms: 2.4 + 4 = 6.4
4 + -4x + x2 = 6.4

Factor a perfect square on the left side:
(x + -2)(x + -2) = 6.4

Calculate the square root of the right side: 2.529822128

Break this problem into two subproblems by setting 
(x + -2) equal to 2.529822128 and -2.529822128.

Subproblem 1

x + -2 = 2.529822128 Simplifying x + -2 = 2.529822128 Reorder the terms: -2 + x = 2.529822128 Solving -2 + x = 2.529822128 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 = 2.529822128 + 2 Combine like terms: -2 + 2 = 0 0 + x = 2.529822128 + 2 x = 2.529822128 + 2 Combine like terms: 2.529822128 + 2 = 4.529822128 x = 4.529822128 Simplifying x = 4.529822128

Subproblem 2

x + -2 = -2.529822128 Simplifying x + -2 = -2.529822128 Reorder the terms: -2 + x = -2.529822128 Solving -2 + x = -2.529822128 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 = -2.529822128 + 2 Combine like terms: -2 + 2 = 0 0 + x = -2.529822128 + 2 x = -2.529822128 + 2 Combine like terms: -2.529822128 + 2 = -0.529822128 x = -0.529822128 Simplifying x = -0.529822128

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.529822128, -0.529822128}

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