Given the equation (x+3)2+y2=81, choose ALL correct answers. (1. The center of the circle would lie on the x-axis.) (2. The center of the circle would lie on the y-axis.) (3. The center of the circle would lie in a quadrant.) (4. The radius is 9.) (5. The radius is 40.5) (6. The radius is 81) ( 7. The diameter is 18.) (8. The diameter is 81.) ( 9. The diameter is 162.)

i believe the answer is letter c) 8

step-by-step explanation:

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15