Question

I am totally lost, can someone please help me

When did Pell's net income reach 1500 million dollars, when I(t)=net income, and t=years since 1990, I(t)=145.86t^2+3169.342t-15145.2

Answer 1

These are the two possible solutions: {4.372182851, -26.100840471}

Answer 2

- is not possible... you cannot have - time

Answer 3

I dont know I didnt solve it

Answer 4

http://www.algebrahelp.com/calculators/equation/

I used that calculator

Answer 5

ok i did get that too but what would tha answer be as to when pell's neet income reached 1500 million. I used mathway calculator, with same answer but it don't make sense

Answer 6

the way you would solve it is

\[1,500,000,000=145.86t^2+3169.342t-15145.2\]

Answer 7

What doesn't make sense?

Answer 8

you can divide both sides by something to reduce the high numbers

Answer 9

the question needing to be answered, wanting t know when co. would make 1500 million. prior question to same problem asked what net income would be inyear 2014, which had 1 answer, i guess im confused due to needing a time frame but with 2 answers

Answer 10

the answers are 26.1008 and 4.3722 would i now add to get 30 years?

Answer 11

no one is saying that 1990+4.3722 and the other is saying 1990-26.10008

Answer 12

but to figure out a time frame, i think looking for Years?

Answer 13

yep it says t = years since 1990

Answer 14

so is it safe to say 30 years from 1990, year 2020

Answer 15

not if you had a - answer... i believe the question should be .. in how many years will the net become 1500 milion in that case.... -26 is thrown out because you can't go back in time so you're only answer would be

4.3722+1990=1994

Answer 16

ok, thank you so very much, that s what was confusing me. :)

Answer 17

yeah most problems like this don't ask for the - answer but the graph would look somethign like this