5j^2-2j-1=0

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Solution for 5j^2-2j-1=0 equation:


Simplifying
5j2 + -2j + -1 = 0

Reorder the terms:
-1 + -2j + 5j2 = 0

Solving
-1 + -2j + 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'.
-0.2 + -0.4j + j2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + -0.4j + 0.2 + j2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + -0.4j + j2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + -0.4j + j2 = 0 + 0.2
-0.4j + j2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
-0.4j + j2 = 0.2

The j term is -0.4j.  Take half its coefficient (-0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
-0.4j + 0.04 + j2 = 0.2 + 0.04

Reorder the terms:
0.04 + -0.4j + j2 = 0.2 + 0.04

Combine like terms: 0.2 + 0.04 = 0.24
0.04 + -0.4j + j2 = 0.24

Factor a perfect square on the left side:
(j + -0.2)(j + -0.2) = 0.24

Calculate the square root of the right side: 0.489897949

Break this problem into two subproblems by setting 
(j + -0.2) equal to 0.489897949 and -0.489897949.

Subproblem 1

j + -0.2 = 0.489897949 Simplifying j + -0.2 = 0.489897949 Reorder the terms: -0.2 + j = 0.489897949 Solving -0.2 + j = 0.489897949 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + j = 0.489897949 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + j = 0.489897949 + 0.2 j = 0.489897949 + 0.2 Combine like terms: 0.489897949 + 0.2 = 0.689897949 j = 0.689897949 Simplifying j = 0.689897949

Subproblem 2

j + -0.2 = -0.489897949 Simplifying j + -0.2 = -0.489897949 Reorder the terms: -0.2 + j = -0.489897949 Solving -0.2 + j = -0.489897949 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + j = -0.489897949 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + j = -0.489897949 + 0.2 j = -0.489897949 + 0.2 Combine like terms: -0.489897949 + 0.2 = -0.289897949 j = -0.289897949 Simplifying j = -0.289897949

Solution

The solution to the problem is based on the solutions from the subproblems. j = {0.689897949, -0.289897949}

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