√-1 = i
=(√12 - √-3)(3 + √-4)
=(√12-3i)(3+4i)
=3√12 + 4i√12 - 9i -12i²
=3(2√3) + 4i(2√3) - 9i - 12(-1)
=6√3 + 8i√3 - 9i +12
=12 + 6√3 - 9i + 8i√3
=6(2 + √3) - (9 + 8√3)i
Answer:
The answer is C pay attention in class next time
Answer:
Option D is correct
Step-by-step explanation:
Statement 1
Average weight of 3 dogs = 55 pounds
Total weight of 3 dogs = 55 × 3
Total weight of 3 dogs = 165 pound
Statement 2
Average weight of 5 cats = 9 pounds
Total weight of 5 cats = 9 × 5
Total weight of 5 cats = 45 pounds
New Average = 165 + 45/8
New Average = 210/8
New Average = 26.25 pounds