j^2+18j-23=0

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Solution for j^2+18j-23=0 equation:


Simplifying
j2 + 18j + -23 = 0

Reorder the terms:
-23 + 18j + j2 = 0

Solving
-23 + 18j + j2 = 0

Solving for variable 'j'.

Begin completing the square.

Move the constant term to the right:

Add '23' to each side of the equation.
-23 + 18j + 23 + j2 = 0 + 23

Reorder the terms:
-23 + 23 + 18j + j2 = 0 + 23

Combine like terms: -23 + 23 = 0
0 + 18j + j2 = 0 + 23
18j + j2 = 0 + 23

Combine like terms: 0 + 23 = 23
18j + j2 = 23

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 = 23 + 81

Reorder the terms:
81 + 18j + j2 = 23 + 81

Combine like terms: 23 + 81 = 104
81 + 18j + j2 = 104

Factor a perfect square on the left side:
(j + 9)(j + 9) = 104

Calculate the square root of the right side: 10.198039027

Break this problem into two subproblems by setting 
(j + 9) equal to 10.198039027 and -10.198039027.

Subproblem 1

j + 9 = 10.198039027 Simplifying j + 9 = 10.198039027 Reorder the terms: 9 + j = 10.198039027 Solving 9 + j = 10.198039027 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 = 10.198039027 + -9 Combine like terms: 9 + -9 = 0 0 + j = 10.198039027 + -9 j = 10.198039027 + -9 Combine like terms: 10.198039027 + -9 = 1.198039027 j = 1.198039027 Simplifying j = 1.198039027

Subproblem 2

j + 9 = -10.198039027 Simplifying j + 9 = -10.198039027 Reorder the terms: 9 + j = -10.198039027 Solving 9 + j = -10.198039027 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 = -10.198039027 + -9 Combine like terms: 9 + -9 = 0 0 + j = -10.198039027 + -9 j = -10.198039027 + -9 Combine like terms: -10.198039027 + -9 = -19.198039027 j = -19.198039027 Simplifying j = -19.198039027

Solution

The solution to the problem is based on the solutions from the subproblems. j = {1.198039027, -19.198039027}

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