Question

Please help it’s for a test it’s due in 30 minutes!!!!!!!

Answer 1

b=9

If b=9, then the i's will cancel out in the middle. When you multiply the two i's together, it makes 27i^2, and i sqaured is negative one so it would be negative 27. -18i and 18i would cancel, and you'll multiply 2 and 6 to get 12.

-27+12=-15

sorry, I edited it and meant b. Sorry about that! b=9

(2-3i)(6+9i)

12+18i-18i-27i^2

12+27i^2

12-27

-15