Answer:
16-15i
Explanation:
(5-7i+i²) + (8i³+12)
i²= -1 and i³=-i, so we can substitute those in and rewrite the equation as
(5-7i-1) + (-8i+12)
We can now drop the parentheses because there is no multiplication or distribution involved.
5-7i-1 + -8i+12
And just rearrange the order of the terms to make it easier to combine like terms. Just remember to keep negative signs with the correct terms.
5-1+12-7i-8i
And now combine like terms
16-15i
