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IGCSE MATHS Doubts

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Vin:

--- Quote from: ksitna on May 18, 2010, 10:20:01 pm ---i got 2n2+2n-4
did i do it wrong?

--- End quote ---

nop .. the sequence is wrong !! +@

wats the ans !!

SoONa:

--- Quote from: ksitna on May 18, 2010, 10:03:31 pm ---in d1 and 2
u nned the graph

u look at the points that are the least (4,4)
and the highest (6,6)
but first you have to make sure if it really is the highest and lowest
or u can solve it algebraically



VIN yes i think they are answered


--- End quote ---

yeah i got the points  is the final answer 18 n 27??  

haris94:
yea i got it
*jumps in joy*  :P :P

umm no yours isnt right
this is what i did                                                                       4      12     24     40
                                                                                                 8      12     16
a+(n-1)d+0.5(n-1)(n-2)c                                                                   4       4
ok so "a" will be 4 (first term)
"d" will be first difference, that is 8
"c" is second difference thats is 4

so substitute and u get 2n2+2n

Thanks a lot for the fromula   ;D

the_grim_reaper:
You will get 2n^2+ 2n if simplified properly
                    1
see 4+(n-1)8+---(n-1)(n-2)4        
                    2                      
Cut 1/2 by 4 to make it 2.
so its 4+(8n-8)+(n-1)(n-2)2
now,  4-8+8n + (n^2-2n-n+2)2
no its -4+8n+ (n^2-3n+2)2
which is -4+8n +2n^s-6n+4
finally, 2n^2+8n-6n-4+4
which is 2n^2+2n+0= 2n^2 + 2n
By the way, the formula is correct......

princess12:
1,3,6,10 write next 4 sequence fast please  ??? ??? ??? ??? ??? ??? ??? ??? ???
 ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ???
urgently fast reply plaese  ??? ??? ??? ??? ??? ??? ??? ???

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