Asked by Renee
Find the next term and the nth term of the sequence: 2+4, 8+4, 18+4, 32+4, 50+4,...
a) 72 + 4 and 2n2+4
b) 68 + 4 and 68n2 + 72
c) 86 + 4 and 90 + n2
a) 72 + 4 and 2n2+4
b) 68 + 4 and 68n2 + 72
c) 86 + 4 and 90 + n2
Answers
Answered by
bobpursley
what is wrong with a)?
Answered by
Reiny
2+4, 8+4, 18+4, 32+4, 50+4,...
= 2(1^2)+4 + 2(2^2)+4 + 2(3^2)+4 + 2(4^2)+4 + ..
so term 6 would be 2(6^2)+4 = 72+4
and the nth term is 2(n^2)+4
A quick mental check would show that neither b) nor c) produce even the first term, so they definitely wrong.
Unless they would give you three wrong choices, a) is clearly your correct choice.
= 2(1^2)+4 + 2(2^2)+4 + 2(3^2)+4 + 2(4^2)+4 + ..
so term 6 would be 2(6^2)+4 = 72+4
and the nth term is 2(n^2)+4
A quick mental check would show that neither b) nor c) produce even the first term, so they definitely wrong.
Unless they would give you three wrong choices, a) is clearly your correct choice.
Answered by
Renee
omgg thank youu so much! =D xx <3<3
Answered by
Renee
oops this wasn't meant to be a question =s it was meant to be a message!
Answered by
Renee
what am i saying?? sorry! i thought i had responded to a question and...oh sorry. :( whats going on?
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