(x-9)*x=97

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Solution for (x-9)*x=97 equation:


Simplifying
(x + -9) * x = 97

Reorder the terms:
(-9 + x) * x = 97

Reorder the terms for easier multiplication:
x(-9 + x) = 97
(-9 * x + x * x) = 97
(-9x + x2) = 97

Solving
-9x + x2 = 97

Solving for variable 'x'.

Reorder the terms:
-97 + -9x + x2 = 97 + -97

Combine like terms: 97 + -97 = 0
-97 + -9x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '97' to each side of the equation.
-97 + -9x + 97 + x2 = 0 + 97

Reorder the terms:
-97 + 97 + -9x + x2 = 0 + 97

Combine like terms: -97 + 97 = 0
0 + -9x + x2 = 0 + 97
-9x + x2 = 0 + 97

Combine like terms: 0 + 97 = 97
-9x + x2 = 97

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 = 97 + 20.25

Reorder the terms:
20.25 + -9x + x2 = 97 + 20.25

Combine like terms: 97 + 20.25 = 117.25
20.25 + -9x + x2 = 117.25

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = 117.25

Calculate the square root of the right side: 10.828203914

Break this problem into two subproblems by setting 
(x + -4.5) equal to 10.828203914 and -10.828203914.

Subproblem 1

x + -4.5 = 10.828203914 Simplifying x + -4.5 = 10.828203914 Reorder the terms: -4.5 + x = 10.828203914 Solving -4.5 + x = 10.828203914 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 = 10.828203914 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 10.828203914 + 4.5 x = 10.828203914 + 4.5 Combine like terms: 10.828203914 + 4.5 = 15.328203914 x = 15.328203914 Simplifying x = 15.328203914

Subproblem 2

x + -4.5 = -10.828203914 Simplifying x + -4.5 = -10.828203914 Reorder the terms: -4.5 + x = -10.828203914 Solving -4.5 + x = -10.828203914 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 = -10.828203914 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -10.828203914 + 4.5 x = -10.828203914 + 4.5 Combine like terms: -10.828203914 + 4.5 = -6.328203914 x = -6.328203914 Simplifying x = -6.328203914

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.328203914, -6.328203914}

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