Given the values of two terms of an arithmetic sequence find the first four terms

[@brianmclogan]

sorry sometimes I get excited and talk to fast for my students. Recording myself helps me see this as well as great students like yourself letting me know.

[@tranquilitypeace-quiet-med8225]

its ok sir :) you video helps me alot .. keep it up :)

[@brianmclogan]

To find the nth term you will have to plug it into the for formula for nth term an = a1 + (n-1)d where n is the number of terms and d is the difference of terms

[@dannyabifalah2753]

been literally stuck on a problem like this for an hour, i had a1 and couldnt find a problem similar to mine...so all the other exmples were giving me wrong answers... youre a life saver!

[@brianmclogan]

happy to help Danny!!

[@joshuaduca5527]

this really helps me to my study specially my test exam is about arithmethic sequence

[@imhajin]

Im in 6th grade and this video literally changed EVERYTHING for me like wtf ifs so good i underatand everything

[@moyare7057]

Easy way to find the difference is to change the terms into points and use slope formula (1,2),(12,46)

[@darkferiousity]

Hey thanks for the great video just one question. If I have a problem where they give me the value but not the term say the value is -14 but I have to find the nth term and I am also given the first 3 terms of the sequence which would be 2.2, 2, 1.8, ... I know the common difference is -0.2 and I have found out that -14 is the 82 term but that was after subtracting 0.2 82 times which takes up alot of time I know that 5 x -0.2 = -1 so I just multiplied 14 x 5 = 70 + the first 12 terms

[@k-martinchannel9061]

where did you get the 46? I cant understand

[@CRAZYGUY1742]

The third term of a geometric series is 10 and the fifth is 18. Find two possible values of the common ratio and the second term in each case. How do u do this question.

[@brianmclogan]

Basil Shibu You will have to use the general equation for geometric sequences and then plug in both of those terms to determine the ratio. Then once you have the ratio you can determine the first and second term

[@CRAZYGUY1742]

Thanks

[@christianbrown9396]

I had a problem that was similar, but my terms were a7=-8 and a10=1 my first 5 terms were a1=-512 a2=256 a3=-128 a4=64 a5=-32 But all I was give was a7 and a10

[@jayadevjoshi3473]

a=an-1/an-2 and a1=1and a2=3 find value of a3 and a4. Plz sir give me hint for solving this question please sir reply me plzz

[@brexxzy1976]

the comment section is making it more complicated HAHAHAH

[@akaneyasuda4355]

what if you also dont know what a1 is?

[@brianmclogan]

use the formula for an arithmetic sequence to find it by inputing the information you do know

[@tranquilitypeace-quiet-med8225]

kindly discuss slowly :(

[@joshuaduca5527]

its like you only replacing the n to a number

[@scottparker9756]

Wat is Mosquera 3 is me

[@25greengoblin]

lost track :/

[@brianmclogan]

25greengoblin let me know where, post a specific question and I can help

[@25greengoblin]

Mr. McLogan's Math Channel it was where you did 44/11=11d/11, how did you come to that conclustion? i mean, when you did the -2?