## anonymous one year ago ill medal and fan .. What is the explicit formula for the following sequence: -4, -1, 2, 5...? A(n) = -4 + (n - 1)(2) A(n) = -4 + (n - 1)(3) A(n) = 3 + (n - 1)(-4) A(n) = 3(n - 1) + 5

1. trwatkins1

wow this one is hard

2. anonymous

i know 😒

3. trwatkins1

sorry cant figure it out :(

4. anonymous

thank you for trying .

5. anonymous

@jim_thompson5910 @Nnesha @phi

6. Nnesha

looks like arithmetic general equation is $\huge\rm a_n =a_1 +(n-1)d$ where a_1 = first term d=common difference n= term that we have to find to find common difference subtract any term from the previous one $\large\rm \color{red}{d = a_2 - a_1 , a_4 -a_3 , a_3 - a_2}$

7. anonymous

Thank youu !

8. anonymous

It is b right ?

9. Nnesha

idk you tell me is it b ;) why b ? \o^_^o/

10. Nnesha

why not A ?? ;)

11. anonymous

because the difference is positive 3 right

12. Nnesha

:=) gO_Od job! a_1 = first term which is -4 so yea