j^2-6j-8=0

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Solution for j^2-6j-8=0 equation:


Simplifying
j2 + -6j + -8 = 0

Reorder the terms:
-8 + -6j + j2 = 0

Solving
-8 + -6j + j2 = 0

Solving for variable 'j'.

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -6j + 8 + j2 = 0 + 8

Reorder the terms:
-8 + 8 + -6j + j2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -6j + j2 = 0 + 8
-6j + j2 = 0 + 8

Combine like terms: 0 + 8 = 8
-6j + j2 = 8

The j term is -6j.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6j + 9 + j2 = 8 + 9

Reorder the terms:
9 + -6j + j2 = 8 + 9

Combine like terms: 8 + 9 = 17
9 + -6j + j2 = 17

Factor a perfect square on the left side:
(j + -3)(j + -3) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(j + -3) equal to 4.123105626 and -4.123105626.

Subproblem 1

j + -3 = 4.123105626 Simplifying j + -3 = 4.123105626 Reorder the terms: -3 + j = 4.123105626 Solving -3 + j = 4.123105626 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + j = 4.123105626 + 3 Combine like terms: -3 + 3 = 0 0 + j = 4.123105626 + 3 j = 4.123105626 + 3 Combine like terms: 4.123105626 + 3 = 7.123105626 j = 7.123105626 Simplifying j = 7.123105626

Subproblem 2

j + -3 = -4.123105626 Simplifying j + -3 = -4.123105626 Reorder the terms: -3 + j = -4.123105626 Solving -3 + j = -4.123105626 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + j = -4.123105626 + 3 Combine like terms: -3 + 3 = 0 0 + j = -4.123105626 + 3 j = -4.123105626 + 3 Combine like terms: -4.123105626 + 3 = -1.123105626 j = -1.123105626 Simplifying j = -1.123105626

Solution

The solution to the problem is based on the solutions from the subproblems. j = {7.123105626, -1.123105626}

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