Answer :
Answer:
21 + 220i
Step-by-step explanation:
reminder that i² = - 1
(- 11 - 10i)²
= (- 11 - 10i)(- 11 - 10i) ← expand using FOIL
= 121 + 110I + 110I + 100I²
= 121 + 220I + 100(- 1)
= 121 + 220i - 100
= 21 + 220i
Answer:
21 + 220i
Step-by-step explanation:
reminder that i² = - 1
(- 11 - 10i)²
= (- 11 - 10i)(- 11 - 10i) ← expand using FOIL
= 121 + 110I + 110I + 100I²
= 121 + 220I + 100(- 1)
= 121 + 220i - 100
= 21 + 220i