x(9+x)=5(5+3)

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Solution for x(9+x)=5(5+3) equation:


Simplifying
x(9 + x) = 5(5 + 3)
(9 * x + x * x) = 5(5 + 3)
(9x + x2) = 5(5 + 3)

Combine like terms: 5 + 3 = 8
9x + x2 = 5(8)

Multiply 5 * 8
9x + x2 = 40

Solving
9x + x2 = 40

Solving for variable 'x'.

Reorder the terms:
-40 + 9x + x2 = 40 + -40

Combine like terms: 40 + -40 = 0
-40 + 9x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + 9x + 40 + x2 = 0 + 40

Reorder the terms:
-40 + 40 + 9x + x2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + 9x + x2 = 0 + 40
9x + x2 = 0 + 40

Combine like terms: 0 + 40 = 40
9x + x2 = 40

The x term is 9x.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9x + 20.25 + x2 = 40 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 40 + 20.25

Combine like terms: 40 + 20.25 = 60.25
20.25 + 9x + x2 = 60.25

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 60.25

Calculate the square root of the right side: 7.762087348

Break this problem into two subproblems by setting 
(x + 4.5) equal to 7.762087348 and -7.762087348.

Subproblem 1

x + 4.5 = 7.762087348 Simplifying x + 4.5 = 7.762087348 Reorder the terms: 4.5 + x = 7.762087348 Solving 4.5 + x = 7.762087348 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = 7.762087348 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 7.762087348 + -4.5 x = 7.762087348 + -4.5 Combine like terms: 7.762087348 + -4.5 = 3.262087348 x = 3.262087348 Simplifying x = 3.262087348

Subproblem 2

x + 4.5 = -7.762087348 Simplifying x + 4.5 = -7.762087348 Reorder the terms: 4.5 + x = -7.762087348 Solving 4.5 + x = -7.762087348 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = -7.762087348 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -7.762087348 + -4.5 x = -7.762087348 + -4.5 Combine like terms: -7.762087348 + -4.5 = -12.262087348 x = -12.262087348 Simplifying x = -12.262087348

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.262087348, -12.262087348}

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