j^2+2j=13

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Solution for j^2+2j=13 equation:


Simplifying
j2 + 2j = 13

Reorder the terms:
2j + j2 = 13

Solving
2j + j2 = 13

Solving for variable 'j'.

Reorder the terms:
-13 + 2j + j2 = 13 + -13

Combine like terms: 13 + -13 = 0
-13 + 2j + j2 = 0

Begin completing the square.

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + 2j + 13 + j2 = 0 + 13

Reorder the terms:
-13 + 13 + 2j + j2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + 2j + j2 = 0 + 13
2j + j2 = 0 + 13

Combine like terms: 0 + 13 = 13
2j + j2 = 13

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 = 13 + 1

Reorder the terms:
1 + 2j + j2 = 13 + 1

Combine like terms: 13 + 1 = 14
1 + 2j + j2 = 14

Factor a perfect square on the left side:
(j + 1)(j + 1) = 14

Calculate the square root of the right side: 3.741657387

Break this problem into two subproblems by setting 
(j + 1) equal to 3.741657387 and -3.741657387.

Subproblem 1

j + 1 = 3.741657387 Simplifying j + 1 = 3.741657387 Reorder the terms: 1 + j = 3.741657387 Solving 1 + j = 3.741657387 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 = 3.741657387 + -1 Combine like terms: 1 + -1 = 0 0 + j = 3.741657387 + -1 j = 3.741657387 + -1 Combine like terms: 3.741657387 + -1 = 2.741657387 j = 2.741657387 Simplifying j = 2.741657387

Subproblem 2

j + 1 = -3.741657387 Simplifying j + 1 = -3.741657387 Reorder the terms: 1 + j = -3.741657387 Solving 1 + j = -3.741657387 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 = -3.741657387 + -1 Combine like terms: 1 + -1 = 0 0 + j = -3.741657387 + -1 j = -3.741657387 + -1 Combine like terms: -3.741657387 + -1 = -4.741657387 j = -4.741657387 Simplifying j = -4.741657387

Solution

The solution to the problem is based on the solutions from the subproblems. j = {2.741657387, -4.741657387}

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