x^2-89x=9

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Solution for x^2-89x=9 equation:


Simplifying
x2 + -89x = 9

Reorder the terms:
-89x + x2 = 9

Solving
-89x + x2 = 9

Solving for variable 'x'.

Reorder the terms:
-9 + -89x + x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + -89x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -89x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + -89x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -89x + x2 = 0 + 9
-89x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
-89x + x2 = 9

The x term is -89x.  Take half its coefficient (-44.5).
Square it (1980.25) and add it to both sides.

Add '1980.25' to each side of the equation.
-89x + 1980.25 + x2 = 9 + 1980.25

Reorder the terms:
1980.25 + -89x + x2 = 9 + 1980.25

Combine like terms: 9 + 1980.25 = 1989.25
1980.25 + -89x + x2 = 1989.25

Factor a perfect square on the left side:
(x + -44.5)(x + -44.5) = 1989.25

Calculate the square root of the right side: 44.601008957

Break this problem into two subproblems by setting 
(x + -44.5) equal to 44.601008957 and -44.601008957.

Subproblem 1

x + -44.5 = 44.601008957 Simplifying x + -44.5 = 44.601008957 Reorder the terms: -44.5 + x = 44.601008957 Solving -44.5 + x = 44.601008957 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '44.5' to each side of the equation. -44.5 + 44.5 + x = 44.601008957 + 44.5 Combine like terms: -44.5 + 44.5 = 0.0 0.0 + x = 44.601008957 + 44.5 x = 44.601008957 + 44.5 Combine like terms: 44.601008957 + 44.5 = 89.101008957 x = 89.101008957 Simplifying x = 89.101008957

Subproblem 2

x + -44.5 = -44.601008957 Simplifying x + -44.5 = -44.601008957 Reorder the terms: -44.5 + x = -44.601008957 Solving -44.5 + x = -44.601008957 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '44.5' to each side of the equation. -44.5 + 44.5 + x = -44.601008957 + 44.5 Combine like terms: -44.5 + 44.5 = 0.0 0.0 + x = -44.601008957 + 44.5 x = -44.601008957 + 44.5 Combine like terms: -44.601008957 + 44.5 = -0.101008957 x = -0.101008957 Simplifying x = -0.101008957

Solution

The solution to the problem is based on the solutions from the subproblems. x = {89.101008957, -0.101008957}

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