8j^2-5j-8=0

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Solution for 8j^2-5j-8=0 equation:


Simplifying
8j2 + -5j + -8 = 0

Reorder the terms:
-8 + -5j + 8j2 = 0

Solving
-8 + -5j + 8j2 = 0

Solving for variable 'j'.

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

Divide each side by '8'.
-1 + -0.625j + j2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -0.625j + 1 + j2 = 0 + 1

Reorder the terms:
-1 + 1 + -0.625j + j2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -0.625j + j2 = 0 + 1
-0.625j + j2 = 0 + 1

Combine like terms: 0 + 1 = 1
-0.625j + j2 = 1

The j term is -0.625j.  Take half its coefficient (-0.3125).
Square it (0.09765625) and add it to both sides.

Add '0.09765625' to each side of the equation.
-0.625j + 0.09765625 + j2 = 1 + 0.09765625

Reorder the terms:
0.09765625 + -0.625j + j2 = 1 + 0.09765625

Combine like terms: 1 + 0.09765625 = 1.09765625
0.09765625 + -0.625j + j2 = 1.09765625

Factor a perfect square on the left side:
(j + -0.3125)(j + -0.3125) = 1.09765625

Calculate the square root of the right side: 1.047690913

Break this problem into two subproblems by setting 
(j + -0.3125) equal to 1.047690913 and -1.047690913.

Subproblem 1

j + -0.3125 = 1.047690913 Simplifying j + -0.3125 = 1.047690913 Reorder the terms: -0.3125 + j = 1.047690913 Solving -0.3125 + j = 1.047690913 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + j = 1.047690913 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + j = 1.047690913 + 0.3125 j = 1.047690913 + 0.3125 Combine like terms: 1.047690913 + 0.3125 = 1.360190913 j = 1.360190913 Simplifying j = 1.360190913

Subproblem 2

j + -0.3125 = -1.047690913 Simplifying j + -0.3125 = -1.047690913 Reorder the terms: -0.3125 + j = -1.047690913 Solving -0.3125 + j = -1.047690913 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + j = -1.047690913 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + j = -1.047690913 + 0.3125 j = -1.047690913 + 0.3125 Combine like terms: -1.047690913 + 0.3125 = -0.735190913 j = -0.735190913 Simplifying j = -0.735190913

Solution

The solution to the problem is based on the solutions from the subproblems. j = {1.360190913, -0.735190913}

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