(12-3i)+(9+2i)=

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Solution for (12-3i)+(9+2i)= equation:


Simplifying
(12 + -3i) + (9 + 2i) = 0

Remove parenthesis around (12 + -3i)
12 + -3i + (9 + 2i) = 0

Remove parenthesis around (9 + 2i)
12 + -3i + 9 + 2i = 0

Reorder the terms:
12 + 9 + -3i + 2i = 0

Combine like terms: 12 + 9 = 21
21 + -3i + 2i = 0

Combine like terms: -3i + 2i = -1i
21 + -1i = 0

Solving
21 + -1i = 0

Solving for variable 'i'.

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

Add '-21' to each side of the equation.
21 + -21 + -1i = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -1i = 0 + -21
-1i = 0 + -21

Combine like terms: 0 + -21 = -21
-1i = -21

Divide each side by '-1'.
i = 21

Simplifying
i = 21

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