Page 225 - aljaber
P. 225
@ @¶ìÿa@óÝy‹¾a@ u@ @RQR
: .an
.n ≥ 2 an = an−1 + 4 a1 = 3
{an }
: {15 − (−2)n }
15 − (−2)1 = 17
15 − (−2)2 = 11
15 − (−2)3 = 23
15 − (−2)4 = −1
15 − (−2)5 = 47
[Arithmetic Sequences] (.)
.
an +1 − an = d {an }
d n
{2n + 2} .(common difference)
2
.an+1 − an = 2(n + 1) + 2 − (2n + 2) = 2
4, 6, 8, 10, …
.d a1
a2 = a1 + d
a3 = a2 + d = a1 + 2d