Question

Evaluate the expression and write the result in the form
a + bi.
(−3 + i)(7 − 8i)

Answer 1

just multiply like you would with any other numbers, you get -21+24i+7i-8i^2, since i^2 is equal to -1, plug that in and simplify to get -14+31i

Answer 2

thank u

Answer 3

positive?

Answer 4

-21+8 + 24i + 7i would be - 13 +31i wouldn't it?

Answer 5

yes, yes it would :P

Answer 6

apparently I forgot how to add and subtract

Answer 7

No worries, it's the simple stuff that always gets me in trouble!! :-)