(16i-9i)(-10-5i)+(4-2i)=0

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Solution for (16i-9i)(-10-5i)+(4-2i)=0 equation:


Simplifying
(16i + -9i)(-10 + -5i) + (4 + -2i) = 0

Combine like terms: 16i + -9i = 7i
(7i)(-10 + -5i) + (4 + -2i) = 0

Remove parenthesis around (7i)
7i(-10 + -5i) + (4 + -2i) = 0
(-10 * 7i + -5i * 7i) + (4 + -2i) = 0
(-70i + -35i2) + (4 + -2i) = 0

Remove parenthesis around (4 + -2i)
-70i + -35i2 + 4 + -2i = 0

Reorder the terms:
4 + -70i + -2i + -35i2 = 0

Combine like terms: -70i + -2i = -72i
4 + -72i + -35i2 = 0

Solving
4 + -72i + -35i2 = 0

Solving for variable 'i'.

Begin completing the square.  Divide all terms by
-35 the coefficient of the squared term: 

Divide each side by '-35'.
-0.1142857143 + 2.057142857i + i2 = 0

Move the constant term to the right:

Add '0.1142857143' to each side of the equation.
-0.1142857143 + 2.057142857i + 0.1142857143 + i2 = 0 + 0.1142857143

Reorder the terms:
-0.1142857143 + 0.1142857143 + 2.057142857i + i2 = 0 + 0.1142857143

Combine like terms: -0.1142857143 + 0.1142857143 = 0.0000000000
0.0000000000 + 2.057142857i + i2 = 0 + 0.1142857143
2.057142857i + i2 = 0 + 0.1142857143

Combine like terms: 0 + 0.1142857143 = 0.1142857143
2.057142857i + i2 = 0.1142857143

The i term is 2.057142857i.  Take half its coefficient (1.028571429).
Square it (1.057959185) and add it to both sides.

Add '1.057959185' to each side of the equation.
2.057142857i + 1.057959185 + i2 = 0.1142857143 + 1.057959185

Reorder the terms:
1.057959185 + 2.057142857i + i2 = 0.1142857143 + 1.057959185

Combine like terms: 0.1142857143 + 1.057959185 = 1.1722448993
1.057959185 + 2.057142857i + i2 = 1.1722448993

Factor a perfect square on the left side:
(i + 1.028571429)(i + 1.028571429) = 1.1722448993

Calculate the square root of the right side: 1.08270259

Break this problem into two subproblems by setting 
(i + 1.028571429) equal to 1.08270259 and -1.08270259.

Subproblem 1

i + 1.028571429 = 1.08270259 Simplifying i + 1.028571429 = 1.08270259 Reorder the terms: 1.028571429 + i = 1.08270259 Solving 1.028571429 + i = 1.08270259 Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Add '-1.028571429' to each side of the equation. 1.028571429 + -1.028571429 + i = 1.08270259 + -1.028571429 Combine like terms: 1.028571429 + -1.028571429 = 0.000000000 0.000000000 + i = 1.08270259 + -1.028571429 i = 1.08270259 + -1.028571429 Combine like terms: 1.08270259 + -1.028571429 = 0.054131161 i = 0.054131161 Simplifying i = 0.054131161

Subproblem 2

i + 1.028571429 = -1.08270259 Simplifying i + 1.028571429 = -1.08270259 Reorder the terms: 1.028571429 + i = -1.08270259 Solving 1.028571429 + i = -1.08270259 Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Add '-1.028571429' to each side of the equation. 1.028571429 + -1.028571429 + i = -1.08270259 + -1.028571429 Combine like terms: 1.028571429 + -1.028571429 = 0.000000000 0.000000000 + i = -1.08270259 + -1.028571429 i = -1.08270259 + -1.028571429 Combine like terms: -1.08270259 + -1.028571429 = -2.111274019 i = -2.111274019 Simplifying i = -2.111274019

Solution

The solution to the problem is based on the solutions from the subproblems. i = {0.054131161, -2.111274019}

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