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 = 10
49 + -14j + j2 = 10

Factor a perfect square on the left side:
(j + -7)(j + -7) = 10

Calculate the square root of the right side: 3.16227766

Break this problem into two subproblems by setting 
(j + -7) equal to 3.16227766 and -3.16227766.

Subproblem 1

j + -7 = 3.16227766 Simplifying j + -7 = 3.16227766 Reorder the terms: -7 + j = 3.16227766 Solving -7 + j = 3.16227766 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 = 3.16227766 + 7 Combine like terms: -7 + 7 = 0 0 + j = 3.16227766 + 7 j = 3.16227766 + 7 Combine like terms: 3.16227766 + 7 = 10.16227766 j = 10.16227766 Simplifying j = 10.16227766

Subproblem 2

j + -7 = -3.16227766 Simplifying j + -7 = -3.16227766 Reorder the terms: -7 + j = -3.16227766 Solving -7 + j = -3.16227766 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 = -3.16227766 + 7 Combine like terms: -7 + 7 = 0 0 + j = -3.16227766 + 7 j = -3.16227766 + 7 Combine like terms: -3.16227766 + 7 = 3.83772234 j = 3.83772234 Simplifying j = 3.83772234

Solution

The solution to the problem is based on the solutions from the subproblems. j = {10.16227766, 3.83772234}

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