-Whiplash-
New member
- Joined
- Jan 22, 2014
- Messages
- 24
I did a pre-calculus assignment and I recently got it back, I was told to do it over again because I failed it because I did not show my work.
I'm doing pre-calculus by correspondence. (which I hate BTW, since I have no one to ask for help)
Anyway....
the question is as follows:
t3+t4=36
t5+t6=144 find all geometric sequences in which this is true.
Now, originally I did this but didn't include much of my work on the page which got my a 0/10 on the question. but what I did was:
I factored 32 and 144 to find the common factors of 3 and 2, then I applied the geometric formula to find that 3x2^n-1 gives me a correct formula, and results in:
t1=3
t2=6
t3=12
t4=24
t5=48
t5=96
since 12+24 = 36
and 48+96=144 I figured that would be good enough but apparently not so. what should I do? how would I go about solving this? the marker wrote under the question that I should "look for the common ratio" but I'm not sure if he means factor it out like I did or not, is there something I'm missing?
I'm doing pre-calculus by correspondence. (which I hate BTW, since I have no one to ask for help)
Anyway....
the question is as follows:
t3+t4=36
t5+t6=144 find all geometric sequences in which this is true.
Now, originally I did this but didn't include much of my work on the page which got my a 0/10 on the question. but what I did was:
I factored 32 and 144 to find the common factors of 3 and 2, then I applied the geometric formula to find that 3x2^n-1 gives me a correct formula, and results in:
t1=3
t2=6
t3=12
t4=24
t5=48
t5=96
since 12+24 = 36
and 48+96=144 I figured that would be good enough but apparently not so. what should I do? how would I go about solving this? the marker wrote under the question that I should "look for the common ratio" but I'm not sure if he means factor it out like I did or not, is there something I'm missing?