Janet said that the common difference in the sequence below is -2. Is she correct? Justify your answer using complete sentences and proper grammar.
1, -2, 4, -8....

Question

Janet said that the common difference in the sequence below is -2. Is she correct? Justify your answer using complete sentences and proper grammar.
1, -2, 4, -8....

freckles · Answer

well what are the following equal to
term-previous term:

-2-1=
4-(-2)=
-8-4=

freckles · Answer

if they are all the same number then the sequence does have a common difference
and whatever number that is is the common difference

anonymous · Answer

So yeah

freckles · Answer

did you actually perform the differences above?

anonymous · Answer

yes .

freckles · Answer

-2-1=?
4-(-2)=?
-8-4=?

freckles · Answer

so you got each one of those is -2?

anonymous · Answer

No

freckles · Answer

right the answer is no the sequence doesn't have a common difference because 
-2-1 is not the same as 4-(-2) or the same as -8-4

anonymous · Answer

but i thought because when multiplied by -2 idk i thought multiplying made sense

freckles · Answer

common difference assumes you have an arithemetic sequence and we don't

anonymous · Answer

ooohhhhhhhhh

freckles · Answer

common ratio assumes we have a geometric sequence which we do

freckles · Answer

the word that makes the whole thing false is the difference word

freckles · Answer

if they said common ratio then it would have been true

anonymous · Answer

ohh , thank you so much .

freckles · Answer

since term/previous term =-2 
that is -2/1=4/-2=-8/4=-2

freckles · Answer

and np