j^2+4j-1=0

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Solution for j^2+4j-1=0 equation:


Simplifying
j2 + 4j + -1 = 0

Reorder the terms:
-1 + 4j + j2 = 0

Solving
-1 + 4j + j2 = 0

Solving for variable 'j'.

Begin completing the square.

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 4j + 1 + j2 = 0 + 1

Reorder the terms:
-1 + 1 + 4j + j2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 4j + j2 = 0 + 1
4j + j2 = 0 + 1

Combine like terms: 0 + 1 = 1
4j + j2 = 1

The j term is 4j.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4j + 4 + j2 = 1 + 4

Reorder the terms:
4 + 4j + j2 = 1 + 4

Combine like terms: 1 + 4 = 5
4 + 4j + j2 = 5

Factor a perfect square on the left side:
(j + 2)(j + 2) = 5

Calculate the square root of the right side: 2.236067978

Break this problem into two subproblems by setting 
(j + 2) equal to 2.236067978 and -2.236067978.

Subproblem 1

j + 2 = 2.236067978 Simplifying j + 2 = 2.236067978 Reorder the terms: 2 + j = 2.236067978 Solving 2 + j = 2.236067978 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + j = 2.236067978 + -2 Combine like terms: 2 + -2 = 0 0 + j = 2.236067978 + -2 j = 2.236067978 + -2 Combine like terms: 2.236067978 + -2 = 0.236067978 j = 0.236067978 Simplifying j = 0.236067978

Subproblem 2

j + 2 = -2.236067978 Simplifying j + 2 = -2.236067978 Reorder the terms: 2 + j = -2.236067978 Solving 2 + j = -2.236067978 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + j = -2.236067978 + -2 Combine like terms: 2 + -2 = 0 0 + j = -2.236067978 + -2 j = -2.236067978 + -2 Combine like terms: -2.236067978 + -2 = -4.236067978 j = -4.236067978 Simplifying j = -4.236067978

Solution

The solution to the problem is based on the solutions from the subproblems. j = {0.236067978, -4.236067978}

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