Math Is Fun Forum

Taibah

Guest

plz help me in solving equations using a+b+c method

:cool:well cn u help me in working out quadratic sequences which means u work out the sequence n den u find the diffference 4 example 4, 6, 8, 10 den u find da difference between dem which is two so den we have three numbers n da first term is it n hw cn we use the a+b+c method

luca-deltodesco

Member

Registered: 2006-05-05

Posts: 1,470

Re: plz help me in solving equations using a+b+c method

if you have a sequence

then the term for n = 1 will be equal to a + b + c

..

the first sequence of differences is:

and the second sequence of differences is:

..

if we start with f_1 and have f_2 and f_3, then n = 1 and we have the following:

...

so for example, the following sequence of 3 numbers, starting from n = 1

2,3,10

the sequence of differences is

1,7

which gives a second difference of 6

so we have:

Last edited by luca-deltodesco (2009-09-12 01:22:34)

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