Question

Write the first four terms of the geometric sequence in which a1 = -3 and r = -4.
a.
-3, 12, -48, 192
c.
–3, -12, -48, -192
b.
3, 12, 48, 192
d.
3, -12, 48, -192

Answer 1

@mathstudent55

Answer 2

@phi

Answer 3

@ganeshie8

Answer 4

@Hero

Answer 5

What grade r u in : P?

Answer 6

later pls

Answer 7

geometric sequence

that means the sequence goes

\[ a_1 r^0, a_1 r^1, a_2 r^2, a_1 r^3 ,...\]

Answer 8

@D3xt3R help once again :P

Answer 9

yeah @phi agree

Answer 10

you know a1 and you know r, (and you should know that r^0 (not matter what r is) is 1

so you know the first number in the sequence. what is it ?

Answer 11

-3

Answer 12

oh i see
so it is A?

Answer 13

in other words, a1*1 = -3*1 = -3

so we can rule out c and d

it's 50-50 now!

Answer 14

the next term is
the first term times r

r is -4

what is the first term times -4 ?

Answer 15

12

Answer 16

A ?

Answer 17

only a is on the right track. bingo!

Answer 18

thanks