x(-2x+18)-35=0

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Solution for x(-2x+18)-35=0 equation:


Simplifying
x(-2x + 18) + -35 = 0

Reorder the terms:
x(18 + -2x) + -35 = 0
(18 * x + -2x * x) + -35 = 0
(18x + -2x2) + -35 = 0

Reorder the terms:
-35 + 18x + -2x2 = 0

Solving
-35 + 18x + -2x2 = 0

Solving for variable 'x'.

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

Divide each side by '-2'.
17.5 + -9x + x2 = 0

Move the constant term to the right:

Add '-17.5' to each side of the equation.
17.5 + -9x + -17.5 + x2 = 0 + -17.5

Reorder the terms:
17.5 + -17.5 + -9x + x2 = 0 + -17.5

Combine like terms: 17.5 + -17.5 = 0.0
0.0 + -9x + x2 = 0 + -17.5
-9x + x2 = 0 + -17.5

Combine like terms: 0 + -17.5 = -17.5
-9x + x2 = -17.5

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 = -17.5 + 20.25

Reorder the terms:
20.25 + -9x + x2 = -17.5 + 20.25

Combine like terms: -17.5 + 20.25 = 2.75
20.25 + -9x + x2 = 2.75

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = 2.75

Calculate the square root of the right side: 1.658312395

Break this problem into two subproblems by setting 
(x + -4.5) equal to 1.658312395 and -1.658312395.

Subproblem 1

x + -4.5 = 1.658312395 Simplifying x + -4.5 = 1.658312395 Reorder the terms: -4.5 + x = 1.658312395 Solving -4.5 + x = 1.658312395 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 = 1.658312395 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 1.658312395 + 4.5 x = 1.658312395 + 4.5 Combine like terms: 1.658312395 + 4.5 = 6.158312395 x = 6.158312395 Simplifying x = 6.158312395

Subproblem 2

x + -4.5 = -1.658312395 Simplifying x + -4.5 = -1.658312395 Reorder the terms: -4.5 + x = -1.658312395 Solving -4.5 + x = -1.658312395 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 = -1.658312395 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -1.658312395 + 4.5 x = -1.658312395 + 4.5 Combine like terms: -1.658312395 + 4.5 = 2.841687605 x = 2.841687605 Simplifying x = 2.841687605

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.158312395, 2.841687605}

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