Answer:
1: -2.7, -9, -30, -100
2: -1, 2.5, -6.25, 15.625
3:4, -4, -12, -20
Step-by-step explanation:
Answer:
z=i+2
,
z=i-2
Step-by-step explanation:
Remember that the quadratic equation has the complex solutions (this is the quadratic formula).
Apply this with a=1, b=-2i and c=-5 to get:
. Then the solutions are
and
It isn't necessary to use De Moivre's formula.
Let's denote Cindy's age which is unknown with X
We know that Cindy's age is 3 times her age 6 years ago.
6 years ago Cindy's age was the present age (X) - 6 : X-6
The fact that the present age is 3 times her age 6 year ago can be written as:
3*(X-6)
So, finally:
X=3*(X-6)
Answer:
sorry happy Halloween btw :D