Question

Write an equation for the nth term of the given geometric sequence.   –9, –27, –81, ... an

i dont get how to do these types of problems

Answer 1

well, notice that \(\bf -1^{st} \implies-9 = -3^2\\
2^{nd} \implies-27 = -3^3\\
3^{rd}\implies-81 = -3^4\)

Answer 2

so what do you mean jdoe like you mean i should just mulitply each number or find the difference

Answer 3

thats all it says jim thopm

Answer 4

find the difference first, yes, the so-called common ratio

Answer 5

a.
–9(-3)^n-1 is one of the answers or selctions to choose from so idkk how to get the n-1 or what that means

Answer 6

the difference is *-3 right

Answer 7

n = nth term

Answer 8

ok thank you

Answer 9

Write an equation for the nth term of the given geometric sequence.

4, 20, 100, ..., an how about this one though how do i write an equation

Answer 10

well, the difference is just the exponent really
the term 1, is 1+1 =2
for the term 2, is (1+1)+1 =3
for the term 3, is (1+1+1)+1 =4

Answer 11

well, just find the common ratio first
the geometric sequence equation is \(\bf \huge a_1 = a_1(r)^{n-1}\)

Answer 12

\(\bf \huge a_n = a_1(r)^{n-1}\) rather
for n = nth term

Answer 13

is it 100(5)^n-1 or 4(5)^n-1 its gotta be one of these right? not a 4(1/5)^n-1 fractioned 1/5

Answer 14

\(\huge a_1\) = 1st term in the sequence

Answer 15

ok thank you j

Answer 16

yw