3j^2-20j=12

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Solution for 3j^2-20j=12 equation:


Simplifying
3j2 + -20j = 12

Reorder the terms:
-20j + 3j2 = 12

Solving
-20j + 3j2 = 12

Solving for variable 'j'.

Reorder the terms:
-12 + -20j + 3j2 = 12 + -12

Combine like terms: 12 + -12 = 0
-12 + -20j + 3j2 = 0

Begin completing the square.  Divide all terms by
3 the coefficient of the squared term: 

Divide each side by '3'.
-4 + -6.666666667j + j2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -6.666666667j + 4 + j2 = 0 + 4

Reorder the terms:
-4 + 4 + -6.666666667j + j2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -6.666666667j + j2 = 0 + 4
-6.666666667j + j2 = 0 + 4

Combine like terms: 0 + 4 = 4
-6.666666667j + j2 = 4

The j term is -6.666666667j.  Take half its coefficient (-3.333333334).
Square it (11.11111112) and add it to both sides.

Add '11.11111112' to each side of the equation.
-6.666666667j + 11.11111112 + j2 = 4 + 11.11111112

Reorder the terms:
11.11111112 + -6.666666667j + j2 = 4 + 11.11111112

Combine like terms: 4 + 11.11111112 = 15.11111112
11.11111112 + -6.666666667j + j2 = 15.11111112

Factor a perfect square on the left side:
(j + -3.333333334)(j + -3.333333334) = 15.11111112

Calculate the square root of the right side: 3.887301264

Break this problem into two subproblems by setting 
(j + -3.333333334) equal to 3.887301264 and -3.887301264.

Subproblem 1

j + -3.333333334 = 3.887301264 Simplifying j + -3.333333334 = 3.887301264 Reorder the terms: -3.333333334 + j = 3.887301264 Solving -3.333333334 + j = 3.887301264 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '3.333333334' to each side of the equation. -3.333333334 + 3.333333334 + j = 3.887301264 + 3.333333334 Combine like terms: -3.333333334 + 3.333333334 = 0.000000000 0.000000000 + j = 3.887301264 + 3.333333334 j = 3.887301264 + 3.333333334 Combine like terms: 3.887301264 + 3.333333334 = 7.220634598 j = 7.220634598 Simplifying j = 7.220634598

Subproblem 2

j + -3.333333334 = -3.887301264 Simplifying j + -3.333333334 = -3.887301264 Reorder the terms: -3.333333334 + j = -3.887301264 Solving -3.333333334 + j = -3.887301264 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '3.333333334' to each side of the equation. -3.333333334 + 3.333333334 + j = -3.887301264 + 3.333333334 Combine like terms: -3.333333334 + 3.333333334 = 0.000000000 0.000000000 + j = -3.887301264 + 3.333333334 j = -3.887301264 + 3.333333334 Combine like terms: -3.887301264 + 3.333333334 = -0.55396793 j = -0.55396793 Simplifying j = -0.55396793

Solution

The solution to the problem is based on the solutions from the subproblems. j = {7.220634598, -0.55396793}

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