Question

the function D(x) models the cumulative number of death fom a diease x years after 1984. Estimate the year when there were 95000 deaths
D(x)=3680^2+5079x+5873

There approximately 95000 deaths in the year ?

Answer 1

I think u meant:
D(x)=3680x^2+5079x+5873

Answer 2

Now to find the approximate year when there were 95000 deaths:
D(x)=3680^2+5079x+5873=95000

Answer 3

3680^2+5079x+5873=95000, solve for x

Answer 4

3680^2+5079x-89127=0

Answer 5

oh man I've been copying off your stuff so I'm also ending up with no x^2.. hold on

Answer 6

Now to find the approximate year when there were 95000 deaths:
D(x)=3680x^2+5079x+5873=95000
3680x^2+5079x+5873=95000, solve for x
3680x^2+5079x-89127=0
http://www.wolframalpha.com/input/?i=Solve%283680x%5E2%2B5079x-89127%3D0%29

Answer 7

According to wolf, x1 = -5.7 and x2 = 4.3. Since we can't go back in time yet, our answer must be positive, therefore x = 4.3

Answer 8

There approximately 95000 deaths in the year 1984+x
There approximately 95000 deaths in the year 1984 + 4.3
There approximately 95000 deaths in the year 1988.3 or roughly 1988

Answer 9

Thnak u for showing the steps, so that I can understand...

Answer 10

Please click on Good Answer if I helped, I really want to get to the next level, thanks =)!

Answer 11

I did and I always do for u, thanks....