2j^2-6j-5=0

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Solution for 2j^2-6j-5=0 equation:


Simplifying
2j2 + -6j + -5 = 0

Reorder the terms:
-5 + -6j + 2j2 = 0

Solving
-5 + -6j + 2j2 = 0

Solving for variable 'j'.

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-2.5 + -3j + j2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -3j + 2.5 + j2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -3j + j2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -3j + j2 = 0 + 2.5
-3j + j2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-3j + j2 = 2.5

The j term is -3j.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3j + 2.25 + j2 = 2.5 + 2.25

Reorder the terms:
2.25 + -3j + j2 = 2.5 + 2.25

Combine like terms: 2.5 + 2.25 = 4.75
2.25 + -3j + j2 = 4.75

Factor a perfect square on the left side:
(j + -1.5)(j + -1.5) = 4.75

Calculate the square root of the right side: 2.179449472

Break this problem into two subproblems by setting 
(j + -1.5) equal to 2.179449472 and -2.179449472.

Subproblem 1

j + -1.5 = 2.179449472 Simplifying j + -1.5 = 2.179449472 Reorder the terms: -1.5 + j = 2.179449472 Solving -1.5 + j = 2.179449472 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + j = 2.179449472 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + j = 2.179449472 + 1.5 j = 2.179449472 + 1.5 Combine like terms: 2.179449472 + 1.5 = 3.679449472 j = 3.679449472 Simplifying j = 3.679449472

Subproblem 2

j + -1.5 = -2.179449472 Simplifying j + -1.5 = -2.179449472 Reorder the terms: -1.5 + j = -2.179449472 Solving -1.5 + j = -2.179449472 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + j = -2.179449472 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + j = -2.179449472 + 1.5 j = -2.179449472 + 1.5 Combine like terms: -2.179449472 + 1.5 = -0.679449472 j = -0.679449472 Simplifying j = -0.679449472

Solution

The solution to the problem is based on the solutions from the subproblems. j = {3.679449472, -0.679449472}

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