Question

Simplify the expression. (-3 + 6i)(-3 + 5i)

Answer 1

-21-33i

Explanation:

(-3+6i)(-3+5i)=9-15i-18i+30i²=9-33i+30(-1)=-21-33i

Answer 2

When we expand we get -9 - 33i + 30i². Since i² = -1 we can write this as -9 - 33i + 30 * (-1) = -9 - 33i - 30 = -33i - 39.