5j^2+3j-1=0

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Solution for 5j^2+3j-1=0 equation:


Simplifying
5j2 + 3j + -1 = 0

Reorder the terms:
-1 + 3j + 5j2 = 0

Solving
-1 + 3j + 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 + 0.6j + j2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + 0.6j + 0.2 + j2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + 0.6j + j2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + 0.6j + j2 = 0 + 0.2
0.6j + j2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
0.6j + j2 = 0.2

The j term is 0.6j.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6j + 0.09 + j2 = 0.2 + 0.09

Reorder the terms:
0.09 + 0.6j + j2 = 0.2 + 0.09

Combine like terms: 0.2 + 0.09 = 0.29
0.09 + 0.6j + j2 = 0.29

Factor a perfect square on the left side:
(j + 0.3)(j + 0.3) = 0.29

Calculate the square root of the right side: 0.538516481

Break this problem into two subproblems by setting 
(j + 0.3) equal to 0.538516481 and -0.538516481.

Subproblem 1

j + 0.3 = 0.538516481 Simplifying j + 0.3 = 0.538516481 Reorder the terms: 0.3 + j = 0.538516481 Solving 0.3 + j = 0.538516481 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + j = 0.538516481 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + j = 0.538516481 + -0.3 j = 0.538516481 + -0.3 Combine like terms: 0.538516481 + -0.3 = 0.238516481 j = 0.238516481 Simplifying j = 0.238516481

Subproblem 2

j + 0.3 = -0.538516481 Simplifying j + 0.3 = -0.538516481 Reorder the terms: 0.3 + j = -0.538516481 Solving 0.3 + j = -0.538516481 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + j = -0.538516481 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + j = -0.538516481 + -0.3 j = -0.538516481 + -0.3 Combine like terms: -0.538516481 + -0.3 = -0.838516481 j = -0.838516481 Simplifying j = -0.838516481

Solution

The solution to the problem is based on the solutions from the subproblems. j = {0.238516481, -0.838516481}

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