(12+4i)-(3-7i)=

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Solution for (12+4i)-(3-7i)= equation:


Simplifying
(12 + 4i) + -1(3 + -7i) = 0

Remove parenthesis around (12 + 4i)
12 + 4i + -1(3 + -7i) = 0
12 + 4i + (3 * -1 + -7i * -1) = 0
12 + 4i + (-3 + 7i) = 0

Reorder the terms:
12 + -3 + 4i + 7i = 0

Combine like terms: 12 + -3 = 9
9 + 4i + 7i = 0

Combine like terms: 4i + 7i = 11i
9 + 11i = 0

Solving
9 + 11i = 0

Solving for variable 'i'.

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

Add '-9' to each side of the equation.
9 + -9 + 11i = 0 + -9

Combine like terms: 9 + -9 = 0
0 + 11i = 0 + -9
11i = 0 + -9

Combine like terms: 0 + -9 = -9
11i = -9

Divide each side by '11'.
i = -0.8181818182

Simplifying
i = -0.8181818182

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