Answer:

Step-by-step explanation:

Answer:
65 + 13i
Step-by-step explanation:
reminder that i² = - 1
13i(1 - 5i) ← multiply each term in the parenthesis by 13i
= 13i - 65i²
= 13i - 65(- 1)
= 13i + 65
= 65 + 13i ← in standard form
Answer:
The center is at ( (-1, -2) and the radius is 5.
Step-by-step explanation:
X^2 + 2X + Y^2 + 4Y = 20
Complete the square on the x and y terms.
(x + 1)^2 -1 + (y + 2)^2 - 4 = 20
(x + 1)^2 + ( y + 2)^2 = 25 Comparing this with the standard form:
(x - h)^2 + (y - k)^2 = r^2
- the center is at ( (-1, -2) and thr radius is 5.
The answer to the question