19j(5j-7)=15

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Solution for 19j(5j-7)=15 equation:


Simplifying
19j(5j + -7) = 15

Reorder the terms:
19j(-7 + 5j) = 15
(-7 * 19j + 5j * 19j) = 15
(-133j + 95j2) = 15

Solving
-133j + 95j2 = 15

Solving for variable 'j'.

Reorder the terms:
-15 + -133j + 95j2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + -133j + 95j2 = 0

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

Divide each side by '95'.
-0.1578947368 + -1.4j + j2 = 0

Move the constant term to the right:

Add '0.1578947368' to each side of the equation.
-0.1578947368 + -1.4j + 0.1578947368 + j2 = 0 + 0.1578947368

Reorder the terms:
-0.1578947368 + 0.1578947368 + -1.4j + j2 = 0 + 0.1578947368

Combine like terms: -0.1578947368 + 0.1578947368 = 0.0000000000
0.0000000000 + -1.4j + j2 = 0 + 0.1578947368
-1.4j + j2 = 0 + 0.1578947368

Combine like terms: 0 + 0.1578947368 = 0.1578947368
-1.4j + j2 = 0.1578947368

The j term is -1.4j.  Take half its coefficient (-0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
-1.4j + 0.49 + j2 = 0.1578947368 + 0.49

Reorder the terms:
0.49 + -1.4j + j2 = 0.1578947368 + 0.49

Combine like terms: 0.1578947368 + 0.49 = 0.6478947368
0.49 + -1.4j + j2 = 0.6478947368

Factor a perfect square on the left side:
(j + -0.7)(j + -0.7) = 0.6478947368

Calculate the square root of the right side: 0.804919087

Break this problem into two subproblems by setting 
(j + -0.7) equal to 0.804919087 and -0.804919087.

Subproblem 1

j + -0.7 = 0.804919087 Simplifying j + -0.7 = 0.804919087 Reorder the terms: -0.7 + j = 0.804919087 Solving -0.7 + j = 0.804919087 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + j = 0.804919087 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + j = 0.804919087 + 0.7 j = 0.804919087 + 0.7 Combine like terms: 0.804919087 + 0.7 = 1.504919087 j = 1.504919087 Simplifying j = 1.504919087

Subproblem 2

j + -0.7 = -0.804919087 Simplifying j + -0.7 = -0.804919087 Reorder the terms: -0.7 + j = -0.804919087 Solving -0.7 + j = -0.804919087 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + j = -0.804919087 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + j = -0.804919087 + 0.7 j = -0.804919087 + 0.7 Combine like terms: -0.804919087 + 0.7 = -0.104919087 j = -0.104919087 Simplifying j = -0.104919087

Solution

The solution to the problem is based on the solutions from the subproblems. j = {1.504919087, -0.104919087}

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