(12+9i)+(5-2i)=

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Solution for (12+9i)+(5-2i)= equation:


Simplifying
(12 + 9i) + (5 + -2i) = 0

Remove parenthesis around (12 + 9i)
12 + 9i + (5 + -2i) = 0

Remove parenthesis around (5 + -2i)
12 + 9i + 5 + -2i = 0

Reorder the terms:
12 + 5 + 9i + -2i = 0

Combine like terms: 12 + 5 = 17
17 + 9i + -2i = 0

Combine like terms: 9i + -2i = 7i
17 + 7i = 0

Solving
17 + 7i = 0

Solving for variable 'i'.

Move all terms containing i to the left, all other terms to the right.

Add '-17' to each side of the equation.
17 + -17 + 7i = 0 + -17

Combine like terms: 17 + -17 = 0
0 + 7i = 0 + -17
7i = 0 + -17

Combine like terms: 0 + -17 = -17
7i = -17

Divide each side by '7'.
i = -2.428571429

Simplifying
i = -2.428571429

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