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

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


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

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

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

Multiply (2 + 4x) * (5 + x)
(2(5 + x) + 4x * (5 + x)) = 5x(x + -5)
((5 * 2 + x * 2) + 4x * (5 + x)) = 5x(x + -5)
((10 + 2x) + 4x * (5 + x)) = 5x(x + -5)
(10 + 2x + (5 * 4x + x * 4x)) = 5x(x + -5)
(10 + 2x + (20x + 4x2)) = 5x(x + -5)

Combine like terms: 2x + 20x = 22x
(10 + 22x + 4x2) = 5x(x + -5)

Reorder the terms:
10 + 22x + 4x2 = 5x(-5 + x)
10 + 22x + 4x2 = (-5 * 5x + x * 5x)
10 + 22x + 4x2 = (-25x + 5x2)

Solving
10 + 22x + 4x2 = -25x + 5x2

Solving for variable 'x'.

Reorder the terms:
10 + 22x + 25x + 4x2 + -5x2 = -25x + 5x2 + 25x + -5x2

Combine like terms: 22x + 25x = 47x
10 + 47x + 4x2 + -5x2 = -25x + 5x2 + 25x + -5x2

Combine like terms: 4x2 + -5x2 = -1x2
10 + 47x + -1x2 = -25x + 5x2 + 25x + -5x2

Reorder the terms:
10 + 47x + -1x2 = -25x + 25x + 5x2 + -5x2

Combine like terms: -25x + 25x = 0
10 + 47x + -1x2 = 0 + 5x2 + -5x2
10 + 47x + -1x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
10 + 47x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-10 + -47x + x2 = 0

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + -47x + 10 + x2 = 0 + 10

Reorder the terms:
-10 + 10 + -47x + x2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + -47x + x2 = 0 + 10
-47x + x2 = 0 + 10

Combine like terms: 0 + 10 = 10
-47x + x2 = 10

The x term is -47x.  Take half its coefficient (-23.5).
Square it (552.25) and add it to both sides.

Add '552.25' to each side of the equation.
-47x + 552.25 + x2 = 10 + 552.25

Reorder the terms:
552.25 + -47x + x2 = 10 + 552.25

Combine like terms: 10 + 552.25 = 562.25
552.25 + -47x + x2 = 562.25

Factor a perfect square on the left side:
(x + -23.5)(x + -23.5) = 562.25

Calculate the square root of the right side: 23.711811403

Break this problem into two subproblems by setting 
(x + -23.5) equal to 23.711811403 and -23.711811403.

Subproblem 1

x + -23.5 = 23.711811403 Simplifying x + -23.5 = 23.711811403 Reorder the terms: -23.5 + x = 23.711811403 Solving -23.5 + x = 23.711811403 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '23.5' to each side of the equation. -23.5 + 23.5 + x = 23.711811403 + 23.5 Combine like terms: -23.5 + 23.5 = 0.0 0.0 + x = 23.711811403 + 23.5 x = 23.711811403 + 23.5 Combine like terms: 23.711811403 + 23.5 = 47.211811403 x = 47.211811403 Simplifying x = 47.211811403

Subproblem 2

x + -23.5 = -23.711811403 Simplifying x + -23.5 = -23.711811403 Reorder the terms: -23.5 + x = -23.711811403 Solving -23.5 + x = -23.711811403 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '23.5' to each side of the equation. -23.5 + 23.5 + x = -23.711811403 + 23.5 Combine like terms: -23.5 + 23.5 = 0.0 0.0 + x = -23.711811403 + 23.5 x = -23.711811403 + 23.5 Combine like terms: -23.711811403 + 23.5 = -0.211811403 x = -0.211811403 Simplifying x = -0.211811403

Solution

The solution to the problem is based on the solutions from the subproblems. x = {47.211811403, -0.211811403}

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