j^2+14j=39

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Solution for j^2+14j=39 equation:


Simplifying
j2 + 14j = 39

Reorder the terms:
14j + j2 = 39

Solving
14j + j2 = 39

Solving for variable 'j'.

Reorder the terms:
-39 + 14j + j2 = 39 + -39

Combine like terms: 39 + -39 = 0
-39 + 14j + j2 = 0

Begin completing the square.

Move the constant term to the right:

Add '39' to each side of the equation.
-39 + 14j + 39 + j2 = 0 + 39

Reorder the terms:
-39 + 39 + 14j + j2 = 0 + 39

Combine like terms: -39 + 39 = 0
0 + 14j + j2 = 0 + 39
14j + j2 = 0 + 39

Combine like terms: 0 + 39 = 39
14j + j2 = 39

The j term is 14j.  Take half its coefficient (7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
14j + 49 + j2 = 39 + 49

Reorder the terms:
49 + 14j + j2 = 39 + 49

Combine like terms: 39 + 49 = 88
49 + 14j + j2 = 88

Factor a perfect square on the left side:
(j + 7)(j + 7) = 88

Calculate the square root of the right side: 9.38083152

Break this problem into two subproblems by setting 
(j + 7) equal to 9.38083152 and -9.38083152.

Subproblem 1

j + 7 = 9.38083152 Simplifying j + 7 = 9.38083152 Reorder the terms: 7 + j = 9.38083152 Solving 7 + j = 9.38083152 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + j = 9.38083152 + -7 Combine like terms: 7 + -7 = 0 0 + j = 9.38083152 + -7 j = 9.38083152 + -7 Combine like terms: 9.38083152 + -7 = 2.38083152 j = 2.38083152 Simplifying j = 2.38083152

Subproblem 2

j + 7 = -9.38083152 Simplifying j + 7 = -9.38083152 Reorder the terms: 7 + j = -9.38083152 Solving 7 + j = -9.38083152 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + j = -9.38083152 + -7 Combine like terms: 7 + -7 = 0 0 + j = -9.38083152 + -7 j = -9.38083152 + -7 Combine like terms: -9.38083152 + -7 = -16.38083152 j = -16.38083152 Simplifying j = -16.38083152

Solution

The solution to the problem is based on the solutions from the subproblems. j = {2.38083152, -16.38083152}

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