j^2-2j=19

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Solution for j^2-2j=19 equation:


Simplifying
j2 + -2j = 19

Reorder the terms:
-2j + j2 = 19

Solving
-2j + j2 = 19

Solving for variable 'j'.

Reorder the terms:
-19 + -2j + j2 = 19 + -19

Combine like terms: 19 + -19 = 0
-19 + -2j + j2 = 0

Begin completing the square.

Move the constant term to the right:

Add '19' to each side of the equation.
-19 + -2j + 19 + j2 = 0 + 19

Reorder the terms:
-19 + 19 + -2j + j2 = 0 + 19

Combine like terms: -19 + 19 = 0
0 + -2j + j2 = 0 + 19
-2j + j2 = 0 + 19

Combine like terms: 0 + 19 = 19
-2j + j2 = 19

The j term is -2j.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2j + 1 + j2 = 19 + 1

Reorder the terms:
1 + -2j + j2 = 19 + 1

Combine like terms: 19 + 1 = 20
1 + -2j + j2 = 20

Factor a perfect square on the left side:
(j + -1)(j + -1) = 20

Calculate the square root of the right side: 4.472135955

Break this problem into two subproblems by setting 
(j + -1) equal to 4.472135955 and -4.472135955.

Subproblem 1

j + -1 = 4.472135955 Simplifying j + -1 = 4.472135955 Reorder the terms: -1 + j = 4.472135955 Solving -1 + j = 4.472135955 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + j = 4.472135955 + 1 Combine like terms: -1 + 1 = 0 0 + j = 4.472135955 + 1 j = 4.472135955 + 1 Combine like terms: 4.472135955 + 1 = 5.472135955 j = 5.472135955 Simplifying j = 5.472135955

Subproblem 2

j + -1 = -4.472135955 Simplifying j + -1 = -4.472135955 Reorder the terms: -1 + j = -4.472135955 Solving -1 + j = -4.472135955 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + j = -4.472135955 + 1 Combine like terms: -1 + 1 = 0 0 + j = -4.472135955 + 1 j = -4.472135955 + 1 Combine like terms: -4.472135955 + 1 = -3.472135955 j = -3.472135955 Simplifying j = -3.472135955

Solution

The solution to the problem is based on the solutions from the subproblems. j = {5.472135955, -3.472135955}

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