Observe the sequences below. I. -3,1,5,9,...
II. 1,2,4,8,...
III. 4,-12,36,-108,...
IV. 7,14,21,28,..
Which of these are arithmetic sequences? A. I, II, and IV B. IV only C. II and III D. I and IV

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

answer: 1475

step-by-step explanation:

becuase you have to know what they are asking you