x(x-9)=35

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Solution for x(x-9)=35 equation:


Simplifying
x(x + -9) = 35

Reorder the terms:
x(-9 + x) = 35
(-9 * x + x * x) = 35
(-9x + x2) = 35

Solving
-9x + x2 = 35

Solving for variable 'x'.

Reorder the terms:
-35 + -9x + x2 = 35 + -35

Combine like terms: 35 + -35 = 0
-35 + -9x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '35' to each side of the equation.
-35 + -9x + 35 + x2 = 0 + 35

Reorder the terms:
-35 + 35 + -9x + x2 = 0 + 35

Combine like terms: -35 + 35 = 0
0 + -9x + x2 = 0 + 35
-9x + x2 = 0 + 35

Combine like terms: 0 + 35 = 35
-9x + x2 = 35

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 = 35 + 20.25

Reorder the terms:
20.25 + -9x + x2 = 35 + 20.25

Combine like terms: 35 + 20.25 = 55.25
20.25 + -9x + x2 = 55.25

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = 55.25

Calculate the square root of the right side: 7.433034374

Break this problem into two subproblems by setting 
(x + -4.5) equal to 7.433034374 and -7.433034374.

Subproblem 1

x + -4.5 = 7.433034374 Simplifying x + -4.5 = 7.433034374 Reorder the terms: -4.5 + x = 7.433034374 Solving -4.5 + x = 7.433034374 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 = 7.433034374 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 7.433034374 + 4.5 x = 7.433034374 + 4.5 Combine like terms: 7.433034374 + 4.5 = 11.933034374 x = 11.933034374 Simplifying x = 11.933034374

Subproblem 2

x + -4.5 = -7.433034374 Simplifying x + -4.5 = -7.433034374 Reorder the terms: -4.5 + x = -7.433034374 Solving -4.5 + x = -7.433034374 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 = -7.433034374 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -7.433034374 + 4.5 x = -7.433034374 + 4.5 Combine like terms: -7.433034374 + 4.5 = -2.933034374 x = -2.933034374 Simplifying x = -2.933034374

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.933034374, -2.933034374}

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