Respuesta :
Answer:
Step-by-step explanation:
A_n = a + (n-1)d
a_n = -2n + 3
when n=1
a_1 = a = -2(1) + 3 = -2 + 3 = 1
when n = 2
a-_2 = -2(2) + 3 = -4 +3 = -1
a_2 = a + d
therefore,
a + d = -1
d = -1 - a
d = - 1 - 1
d = -2
Therefore the sequence is ,
1 , -1, -3, -5, -7.......
Answer:
a_1=-3 a_2= -4 a_3=-3 a_4=-6 a_5=-7
Step-by-step explanation:
We have to find first 5 terms of sequence. It means that n =1 or 2or3 or4 or 5
Only n=3 of them is divisible by 3 . n=1 ,2,4 and 5 are not divisible by 3.
So in case n=3 we have to find a_3 using formula a_n=-2n+3
In all other cases we have to use formula a_n= -n-2.
Lets do it !
a_1= -1-2=-3
a_2=-2-2= -4
a_3=-2*3+3=-6+3=-3
a_4=-4-2=-6
a_5=-5-2=-7
