j^2=-9j+9

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Solution for j^2=-9j+9 equation:


Simplifying
j2 = -9j + 9

Reorder the terms:
j2 = 9 + -9j

Solving
j2 = 9 + -9j

Solving for variable 'j'.

Reorder the terms:
-9 + 9j + j2 = 9 + -9j + -9 + 9j

Reorder the terms:
-9 + 9j + j2 = 9 + -9 + -9j + 9j

Combine like terms: 9 + -9 = 0
-9 + 9j + j2 = 0 + -9j + 9j
-9 + 9j + j2 = -9j + 9j

Combine like terms: -9j + 9j = 0
-9 + 9j + j2 = 0

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 9j + 9 + j2 = 0 + 9

Reorder the terms:
-9 + 9 + 9j + j2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 9j + j2 = 0 + 9
9j + j2 = 0 + 9

Combine like terms: 0 + 9 = 9
9j + j2 = 9

The j term is 9j.  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.
9j + 20.25 + j2 = 9 + 20.25

Reorder the terms:
20.25 + 9j + j2 = 9 + 20.25

Combine like terms: 9 + 20.25 = 29.25
20.25 + 9j + j2 = 29.25

Factor a perfect square on the left side:
(j + 4.5)(j + 4.5) = 29.25

Calculate the square root of the right side: 5.408326913

Break this problem into two subproblems by setting 
(j + 4.5) equal to 5.408326913 and -5.408326913.

Subproblem 1

j + 4.5 = 5.408326913 Simplifying j + 4.5 = 5.408326913 Reorder the terms: 4.5 + j = 5.408326913 Solving 4.5 + j = 5.408326913 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + j = 5.408326913 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + j = 5.408326913 + -4.5 j = 5.408326913 + -4.5 Combine like terms: 5.408326913 + -4.5 = 0.908326913 j = 0.908326913 Simplifying j = 0.908326913

Subproblem 2

j + 4.5 = -5.408326913 Simplifying j + 4.5 = -5.408326913 Reorder the terms: 4.5 + j = -5.408326913 Solving 4.5 + j = -5.408326913 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + j = -5.408326913 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + j = -5.408326913 + -4.5 j = -5.408326913 + -4.5 Combine like terms: -5.408326913 + -4.5 = -9.908326913 j = -9.908326913 Simplifying j = -9.908326913

Solution

The solution to the problem is based on the solutions from the subproblems. j = {0.908326913, -9.908326913}

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