(9+5j)*(7+j)=1

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Solution for (9+5j)*(7+j)=1 equation:


Simplifying
(9 + 5j)(7 + j) = 1

Multiply (9 + 5j) * (7 + j)
(9(7 + j) + 5j * (7 + j)) = 1
((7 * 9 + j * 9) + 5j * (7 + j)) = 1
((63 + 9j) + 5j * (7 + j)) = 1
(63 + 9j + (7 * 5j + j * 5j)) = 1
(63 + 9j + (35j + 5j2)) = 1

Combine like terms: 9j + 35j = 44j
(63 + 44j + 5j2) = 1

Solving
63 + 44j + 5j2 = 1

Solving for variable 'j'.

Reorder the terms:
63 + -1 + 44j + 5j2 = 1 + -1

Combine like terms: 63 + -1 = 62
62 + 44j + 5j2 = 1 + -1

Combine like terms: 1 + -1 = 0
62 + 44j + 5j2 = 0

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

Divide each side by '5'.
12.4 + 8.8j + j2 = 0

Move the constant term to the right:

Add '-12.4' to each side of the equation.
12.4 + 8.8j + -12.4 + j2 = 0 + -12.4

Reorder the terms:
12.4 + -12.4 + 8.8j + j2 = 0 + -12.4

Combine like terms: 12.4 + -12.4 = 0.0
0.0 + 8.8j + j2 = 0 + -12.4
8.8j + j2 = 0 + -12.4

Combine like terms: 0 + -12.4 = -12.4
8.8j + j2 = -12.4

The j term is 8.8j.  Take half its coefficient (4.4).
Square it (19.36) and add it to both sides.

Add '19.36' to each side of the equation.
8.8j + 19.36 + j2 = -12.4 + 19.36

Reorder the terms:
19.36 + 8.8j + j2 = -12.4 + 19.36

Combine like terms: -12.4 + 19.36 = 6.96
19.36 + 8.8j + j2 = 6.96

Factor a perfect square on the left side:
(j + 4.4)(j + 4.4) = 6.96

Calculate the square root of the right side: 2.638181192

Break this problem into two subproblems by setting 
(j + 4.4) equal to 2.638181192 and -2.638181192.

Subproblem 1

j + 4.4 = 2.638181192 Simplifying j + 4.4 = 2.638181192 Reorder the terms: 4.4 + j = 2.638181192 Solving 4.4 + j = 2.638181192 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '-4.4' to each side of the equation. 4.4 + -4.4 + j = 2.638181192 + -4.4 Combine like terms: 4.4 + -4.4 = 0.0 0.0 + j = 2.638181192 + -4.4 j = 2.638181192 + -4.4 Combine like terms: 2.638181192 + -4.4 = -1.761818808 j = -1.761818808 Simplifying j = -1.761818808

Subproblem 2

j + 4.4 = -2.638181192 Simplifying j + 4.4 = -2.638181192 Reorder the terms: 4.4 + j = -2.638181192 Solving 4.4 + j = -2.638181192 Solving for variable 'j'. Move all terms containing j to the left, all other terms to the right. Add '-4.4' to each side of the equation. 4.4 + -4.4 + j = -2.638181192 + -4.4 Combine like terms: 4.4 + -4.4 = 0.0 0.0 + j = -2.638181192 + -4.4 j = -2.638181192 + -4.4 Combine like terms: -2.638181192 + -4.4 = -7.038181192 j = -7.038181192 Simplifying j = -7.038181192

Solution

The solution to the problem is based on the solutions from the subproblems. j = {-1.761818808, -7.038181192}

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