5(5+20)=x(16+x)

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Solution for 5(5+20)=x(16+x) equation:


Simplifying
5(5 + 20) = x(16 + x)

Combine like terms: 5 + 20 = 25
5(25) = x(16 + x)

Multiply 5 * 25
125 = x(16 + x)
125 = (16 * x + x * x)
125 = (16x + x2)

Solving
125 = 16x + x2

Solving for variable 'x'.

Reorder the terms:
125 + -16x + -1x2 = 16x + -16x + x2 + -1x2

Combine like terms: 16x + -16x = 0
125 + -16x + -1x2 = 0 + x2 + -1x2
125 + -16x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
125 + -16x + -1x2 = 0

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

Divide each side by '-1'.
-125 + 16x + x2 = 0

Move the constant term to the right:

Add '125' to each side of the equation.
-125 + 16x + 125 + x2 = 0 + 125

Reorder the terms:
-125 + 125 + 16x + x2 = 0 + 125

Combine like terms: -125 + 125 = 0
0 + 16x + x2 = 0 + 125
16x + x2 = 0 + 125

Combine like terms: 0 + 125 = 125
16x + x2 = 125

The x term is 16x.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16x + 64 + x2 = 125 + 64

Reorder the terms:
64 + 16x + x2 = 125 + 64

Combine like terms: 125 + 64 = 189
64 + 16x + x2 = 189

Factor a perfect square on the left side:
(x + 8)(x + 8) = 189

Calculate the square root of the right side: 13.747727085

Break this problem into two subproblems by setting 
(x + 8) equal to 13.747727085 and -13.747727085.

Subproblem 1

x + 8 = 13.747727085 Simplifying x + 8 = 13.747727085 Reorder the terms: 8 + x = 13.747727085 Solving 8 + x = 13.747727085 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = 13.747727085 + -8 Combine like terms: 8 + -8 = 0 0 + x = 13.747727085 + -8 x = 13.747727085 + -8 Combine like terms: 13.747727085 + -8 = 5.747727085 x = 5.747727085 Simplifying x = 5.747727085

Subproblem 2

x + 8 = -13.747727085 Simplifying x + 8 = -13.747727085 Reorder the terms: 8 + x = -13.747727085 Solving 8 + x = -13.747727085 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = -13.747727085 + -8 Combine like terms: 8 + -8 = 0 0 + x = -13.747727085 + -8 x = -13.747727085 + -8 Combine like terms: -13.747727085 + -8 = -21.747727085 x = -21.747727085 Simplifying x = -21.747727085

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.747727085, -21.747727085}

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