j^2-18j=-1

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Solution for j^2-18j=-1 equation:


Simplifying
j2 + -18j = -1

Reorder the terms:
-18j + j2 = -1

Solving
-18j + j2 = -1

Solving for variable 'j'.

Reorder the terms:
1 + -18j + j2 = -1 + 1

Combine like terms: -1 + 1 = 0
1 + -18j + j2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -18j + -1 + j2 = 0 + -1

Reorder the terms:
1 + -1 + -18j + j2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -18j + j2 = 0 + -1
-18j + j2 = 0 + -1

Combine like terms: 0 + -1 = -1
-18j + j2 = -1

The j term is -18j.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18j + 81 + j2 = -1 + 81

Reorder the terms:
81 + -18j + j2 = -1 + 81

Combine like terms: -1 + 81 = 80
81 + -18j + j2 = 80

Factor a perfect square on the left side:
(j + -9)(j + -9) = 80

Calculate the square root of the right side: 8.94427191

Break this problem into two subproblems by setting 
(j + -9) equal to 8.94427191 and -8.94427191.

Subproblem 1

j + -9 = 8.94427191 Simplifying j + -9 = 8.94427191 Reorder the terms: -9 + j = 8.94427191 Solving -9 + j = 8.94427191 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + j = 8.94427191 + 9 Combine like terms: -9 + 9 = 0 0 + j = 8.94427191 + 9 j = 8.94427191 + 9 Combine like terms: 8.94427191 + 9 = 17.94427191 j = 17.94427191 Simplifying j = 17.94427191

Subproblem 2

j + -9 = -8.94427191 Simplifying j + -9 = -8.94427191 Reorder the terms: -9 + j = -8.94427191 Solving -9 + j = -8.94427191 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + j = -8.94427191 + 9 Combine like terms: -9 + 9 = 0 0 + j = -8.94427191 + 9 j = -8.94427191 + 9 Combine like terms: -8.94427191 + 9 = 0.05572809 j = 0.05572809 Simplifying j = 0.05572809

Solution

The solution to the problem is based on the solutions from the subproblems. j = {17.94427191, 0.05572809}

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