Question

Help medal will be given!!!!
Using the following equation, find the center and radius:
x2 - 4x + y2 + 8y = -4
The center is located at (-2, -4), and the radius is 4.

The center is located at (2, -4), and the radius is 4.

The center is located at (-2, -4), and the radius is 16.

The center is located at (2, -4), and the radius is 16.

Answer 1

@pooja195 could you help plz

Answer 2

convert to standard form by completing the square

Answer 3

x2 - 4x + y2 + 8y = -4
= (x - 2)^2 - 4 + (y + 4)^2 - 16 = -4
= (x - 2)^2 + ( y + 4)^2 = 16

Answer 4

so would it be B

Answer 5

compare this with standard form
(x - a)^2 + (y - b)^2 = r^2

where center = (a,b) and r = radius

Answer 6

yes B

Answer 7

thank you could you help me with another im stuck on

Answer 8

ok

Answer 9

ABCD is a quadrilateral inscribed in a circle:What equation can be used to solve for angle D?

Answer 10

(2x + 16) + (6x - 4) = 90

(x + 16) - (x) = 90

(x + 16) + (2x + 16) = 180

(2x + 16) + (x) = 180

Answer 11

opposite angles of a cyclic quadrilateral add up to 180 degrees

Answer 12

what angle is opposite D?

Answer 13

Is it B?

Answer 14

no

Answer 15

huh

Answer 16

D + B = 180

- plug in the values of D and B

Answer 17

(2x 16) + x =180

Answer 18

yep

Answer 19

thanks