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
5 answers
what is wrong with a)?
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.
omgg thank youu so much! =D xx <3<3
oops this wasn't meant to be a question =s it was meant to be a message!
what am i saying?? sorry! i thought i had responded to a question and...oh sorry. :( whats going on?
3 answers