Question

What is (-1+8i)(-8+8i)

Answer 1

Here you need to apply the complex arithmetic rule: (a+bi) (c+di)
a=-1
c=-8
b=8
d=8
(-1 · (-8) -8·8) + (-1 · 8i+8(-8)i
8-64+-8i-8i-64i
-56-72i