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by Neo Anderson » Tue Mar 06, 2012 6:46 am
as you said it is a linear sequence, consider it as ax+b

given for x=1 ax+b equals -2, i.e. a+b = -2 ---(i)

also that for x=2, 2a+ b= 18 ---(ii)

from (i) and (ii)
a = 20, b = -22
thus the rule is 20x-22,
test for 3rd term => 3 X 20 - 22 = 38
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by tpr-becky » Tue Mar 06, 2012 1:57 pm
each new term is the previous term plus 20.
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