5x(x-4)=2(x+5)

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Solution for 5x(x-4)=2(x+5) equation:


Simplifying
5x(x + -4) = 2(x + 5)

Reorder the terms:
5x(-4 + x) = 2(x + 5)
(-4 * 5x + x * 5x) = 2(x + 5)
(-20x + 5x2) = 2(x + 5)

Reorder the terms:
-20x + 5x2 = 2(5 + x)
-20x + 5x2 = (5 * 2 + x * 2)
-20x + 5x2 = (10 + 2x)

Solving
-20x + 5x2 = 10 + 2x

Solving for variable 'x'.

Reorder the terms:
-10 + -20x + -2x + 5x2 = 10 + 2x + -10 + -2x

Combine like terms: -20x + -2x = -22x
-10 + -22x + 5x2 = 10 + 2x + -10 + -2x

Reorder the terms:
-10 + -22x + 5x2 = 10 + -10 + 2x + -2x

Combine like terms: 10 + -10 = 0
-10 + -22x + 5x2 = 0 + 2x + -2x
-10 + -22x + 5x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
-10 + -22x + 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' to each side of the equation.
-2 + -4.4x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + -4.4x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -4.4x + x2 = 0 + 2
-4.4x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
-4.4x + x2 = 2

The x term is -4.4x.  Take half its coefficient (-2.2).
Square it (4.84) and add it to both sides.

Add '4.84' to each side of the equation.
-4.4x + 4.84 + x2 = 2 + 4.84

Reorder the terms:
4.84 + -4.4x + x2 = 2 + 4.84

Combine like terms: 2 + 4.84 = 6.84
4.84 + -4.4x + x2 = 6.84

Factor a perfect square on the left side:
(x + -2.2)(x + -2.2) = 6.84

Calculate the square root of the right side: 2.615339366

Break this problem into two subproblems by setting 
(x + -2.2) equal to 2.615339366 and -2.615339366.

Subproblem 1

x + -2.2 = 2.615339366 Simplifying x + -2.2 = 2.615339366 Reorder the terms: -2.2 + x = 2.615339366 Solving -2.2 + x = 2.615339366 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.2' to each side of the equation. -2.2 + 2.2 + x = 2.615339366 + 2.2 Combine like terms: -2.2 + 2.2 = 0.0 0.0 + x = 2.615339366 + 2.2 x = 2.615339366 + 2.2 Combine like terms: 2.615339366 + 2.2 = 4.815339366 x = 4.815339366 Simplifying x = 4.815339366

Subproblem 2

x + -2.2 = -2.615339366 Simplifying x + -2.2 = -2.615339366 Reorder the terms: -2.2 + x = -2.615339366 Solving -2.2 + x = -2.615339366 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.2' to each side of the equation. -2.2 + 2.2 + x = -2.615339366 + 2.2 Combine like terms: -2.2 + 2.2 = 0.0 0.0 + x = -2.615339366 + 2.2 x = -2.615339366 + 2.2 Combine like terms: -2.615339366 + 2.2 = -0.415339366 x = -0.415339366 Simplifying x = -0.415339366

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.815339366, -0.415339366}

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