5(x-3)-9x=-2x(x+17)

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Solution for 5(x-3)-9x=-2x(x+17) equation:


Simplifying
5(x + -3) + -9x = -2x(x + 17)

Reorder the terms:
5(-3 + x) + -9x = -2x(x + 17)
(-3 * 5 + x * 5) + -9x = -2x(x + 17)
(-15 + 5x) + -9x = -2x(x + 17)

Combine like terms: 5x + -9x = -4x
-15 + -4x = -2x(x + 17)

Reorder the terms:
-15 + -4x = -2x(17 + x)
-15 + -4x = (17 * -2x + x * -2x)
-15 + -4x = (-34x + -2x2)

Solving
-15 + -4x = -34x + -2x2

Solving for variable 'x'.

Combine like terms: -4x + 34x = 30x
-15 + 30x + 2x2 = -34x + -2x2 + 34x + 2x2

Reorder the terms:
-15 + 30x + 2x2 = -34x + 34x + -2x2 + 2x2

Combine like terms: -34x + 34x = 0
-15 + 30x + 2x2 = 0 + -2x2 + 2x2
-15 + 30x + 2x2 = -2x2 + 2x2

Combine like terms: -2x2 + 2x2 = 0
-15 + 30x + 2x2 = 0

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

Divide each side by '2'.
-7.5 + 15x + x2 = 0

Move the constant term to the right:

Add '7.5' to each side of the equation.
-7.5 + 15x + 7.5 + x2 = 0 + 7.5

Reorder the terms:
-7.5 + 7.5 + 15x + x2 = 0 + 7.5

Combine like terms: -7.5 + 7.5 = 0.0
0.0 + 15x + x2 = 0 + 7.5
15x + x2 = 0 + 7.5

Combine like terms: 0 + 7.5 = 7.5
15x + x2 = 7.5

The x term is 15x.  Take half its coefficient (7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
15x + 56.25 + x2 = 7.5 + 56.25

Reorder the terms:
56.25 + 15x + x2 = 7.5 + 56.25

Combine like terms: 7.5 + 56.25 = 63.75
56.25 + 15x + x2 = 63.75

Factor a perfect square on the left side:
(x + 7.5)(x + 7.5) = 63.75

Calculate the square root of the right side: 7.984359711

Break this problem into two subproblems by setting 
(x + 7.5) equal to 7.984359711 and -7.984359711.

Subproblem 1

x + 7.5 = 7.984359711 Simplifying x + 7.5 = 7.984359711 Reorder the terms: 7.5 + x = 7.984359711 Solving 7.5 + x = 7.984359711 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + x = 7.984359711 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = 7.984359711 + -7.5 x = 7.984359711 + -7.5 Combine like terms: 7.984359711 + -7.5 = 0.484359711 x = 0.484359711 Simplifying x = 0.484359711

Subproblem 2

x + 7.5 = -7.984359711 Simplifying x + 7.5 = -7.984359711 Reorder the terms: 7.5 + x = -7.984359711 Solving 7.5 + x = -7.984359711 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + x = -7.984359711 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = -7.984359711 + -7.5 x = -7.984359711 + -7.5 Combine like terms: -7.984359711 + -7.5 = -15.484359711 x = -15.484359711 Simplifying x = -15.484359711

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.484359711, -15.484359711}

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