j^2-20j-36=0

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Solution for j^2-20j-36=0 equation:


Simplifying
j2 + -20j + -36 = 0

Reorder the terms:
-36 + -20j + j2 = 0

Solving
-36 + -20j + j2 = 0

Solving for variable 'j'.

Begin completing the square.

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + -20j + 36 + j2 = 0 + 36

Reorder the terms:
-36 + 36 + -20j + j2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + -20j + j2 = 0 + 36
-20j + j2 = 0 + 36

Combine like terms: 0 + 36 = 36
-20j + j2 = 36

The j term is -20j.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20j + 100 + j2 = 36 + 100

Reorder the terms:
100 + -20j + j2 = 36 + 100

Combine like terms: 36 + 100 = 136
100 + -20j + j2 = 136

Factor a perfect square on the left side:
(j + -10)(j + -10) = 136

Calculate the square root of the right side: 11.66190379

Break this problem into two subproblems by setting 
(j + -10) equal to 11.66190379 and -11.66190379.

Subproblem 1

j + -10 = 11.66190379 Simplifying j + -10 = 11.66190379 Reorder the terms: -10 + j = 11.66190379 Solving -10 + j = 11.66190379 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + j = 11.66190379 + 10 Combine like terms: -10 + 10 = 0 0 + j = 11.66190379 + 10 j = 11.66190379 + 10 Combine like terms: 11.66190379 + 10 = 21.66190379 j = 21.66190379 Simplifying j = 21.66190379

Subproblem 2

j + -10 = -11.66190379 Simplifying j + -10 = -11.66190379 Reorder the terms: -10 + j = -11.66190379 Solving -10 + j = -11.66190379 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + j = -11.66190379 + 10 Combine like terms: -10 + 10 = 0 0 + j = -11.66190379 + 10 j = -11.66190379 + 10 Combine like terms: -11.66190379 + 10 = -1.66190379 j = -1.66190379 Simplifying j = -1.66190379

Solution

The solution to the problem is based on the solutions from the subproblems. j = {21.66190379, -1.66190379}

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