5x(x+9)=48

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Solution for 5x(x+9)=48 equation:


Simplifying
5x(x + 9) = 48

Reorder the terms:
5x(9 + x) = 48
(9 * 5x + x * 5x) = 48
(45x + 5x2) = 48

Solving
45x + 5x2 = 48

Solving for variable 'x'.

Reorder the terms:
-48 + 45x + 5x2 = 48 + -48

Combine like terms: 48 + -48 = 0
-48 + 45x + 5x2 = 0

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

Divide each side by '5'.
-9.6 + 9x + x2 = 0

Move the constant term to the right:

Add '9.6' to each side of the equation.
-9.6 + 9x + 9.6 + x2 = 0 + 9.6

Reorder the terms:
-9.6 + 9.6 + 9x + x2 = 0 + 9.6

Combine like terms: -9.6 + 9.6 = 0.0
0.0 + 9x + x2 = 0 + 9.6
9x + x2 = 0 + 9.6

Combine like terms: 0 + 9.6 = 9.6
9x + x2 = 9.6

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 = 9.6 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 9.6 + 20.25

Combine like terms: 9.6 + 20.25 = 29.85
20.25 + 9x + x2 = 29.85

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 29.85

Calculate the square root of the right side: 5.463515352

Break this problem into two subproblems by setting 
(x + 4.5) equal to 5.463515352 and -5.463515352.

Subproblem 1

x + 4.5 = 5.463515352 Simplifying x + 4.5 = 5.463515352 Reorder the terms: 4.5 + x = 5.463515352 Solving 4.5 + x = 5.463515352 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 = 5.463515352 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 5.463515352 + -4.5 x = 5.463515352 + -4.5 Combine like terms: 5.463515352 + -4.5 = 0.963515352 x = 0.963515352 Simplifying x = 0.963515352

Subproblem 2

x + 4.5 = -5.463515352 Simplifying x + 4.5 = -5.463515352 Reorder the terms: 4.5 + x = -5.463515352 Solving 4.5 + x = -5.463515352 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 = -5.463515352 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -5.463515352 + -4.5 x = -5.463515352 + -4.5 Combine like terms: -5.463515352 + -4.5 = -9.963515352 x = -9.963515352 Simplifying x = -9.963515352

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.963515352, -9.963515352}

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