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SAT - Math - Complex Numbers

For i=square root of -1, what is the sum (7+3i) + (-8+9i)?

For i=-1, what is the sum (7 3i) (-8 9i)?

While adding complex numbers we add real and imaginary parts separately.

(7+3i) + (-8+9i)

= (7-8) + i(3+9)

= -1 + 12i