5j^2-7j-7=0

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Solution for 5j^2-7j-7=0 equation:


Simplifying
5j2 + -7j + -7 = 0

Reorder the terms:
-7 + -7j + 5j2 = 0

Solving
-7 + -7j + 5j2 = 0

Solving for variable 'j'.

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

Divide each side by '5'.
-1.4 + -1.4j + j2 = 0

Move the constant term to the right:

Add '1.4' to each side of the equation.
-1.4 + -1.4j + 1.4 + j2 = 0 + 1.4

Reorder the terms:
-1.4 + 1.4 + -1.4j + j2 = 0 + 1.4

Combine like terms: -1.4 + 1.4 = 0.0
0.0 + -1.4j + j2 = 0 + 1.4
-1.4j + j2 = 0 + 1.4

Combine like terms: 0 + 1.4 = 1.4
-1.4j + j2 = 1.4

The j term is -1.4j.  Take half its coefficient (-0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
-1.4j + 0.49 + j2 = 1.4 + 0.49

Reorder the terms:
0.49 + -1.4j + j2 = 1.4 + 0.49

Combine like terms: 1.4 + 0.49 = 1.89
0.49 + -1.4j + j2 = 1.89

Factor a perfect square on the left side:
(j + -0.7)(j + -0.7) = 1.89

Calculate the square root of the right side: 1.374772708

Break this problem into two subproblems by setting 
(j + -0.7) equal to 1.374772708 and -1.374772708.

Subproblem 1

j + -0.7 = 1.374772708 Simplifying j + -0.7 = 1.374772708 Reorder the terms: -0.7 + j = 1.374772708 Solving -0.7 + j = 1.374772708 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + j = 1.374772708 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + j = 1.374772708 + 0.7 j = 1.374772708 + 0.7 Combine like terms: 1.374772708 + 0.7 = 2.074772708 j = 2.074772708 Simplifying j = 2.074772708

Subproblem 2

j + -0.7 = -1.374772708 Simplifying j + -0.7 = -1.374772708 Reorder the terms: -0.7 + j = -1.374772708 Solving -0.7 + j = -1.374772708 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + j = -1.374772708 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + j = -1.374772708 + 0.7 j = -1.374772708 + 0.7 Combine like terms: -1.374772708 + 0.7 = -0.674772708 j = -0.674772708 Simplifying j = -0.674772708

Solution

The solution to the problem is based on the solutions from the subproblems. j = {2.074772708, -0.674772708}

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