Question

Can someone explain this to me, but in a easy way where I can understand it?

Answer 1

since all of the x's are consecutive
we are looking for where the second differences is constant

for example
say we have the sequence 3,4,7,12,19,....
the first differences would be 1,3,5,7,...
the second differences would be 2,2,2,....
notice the second differences is constantly the same number
so this is a quadratic sequence

Answer 2

again all of your x's are in consecutive order...
so we only have to worry with y values
determine the second differences for each of the following sequences:
1,4,9,16,...


3,6,9,12,....



3,12,27,48,...


2,5,10,17,....

Answer 3

can you do that?

Answer 4

@Ms-Brains I think you're only expected to look at the graph and see if it resembles a quadratic one

Answer 5

I plotted those fellows, and though all are quadratic candiates, A looks almost like a linear, D looks like exponential, and B and C look like quadratics

so...give them a plot on the cartesian grid, and make your mind

Answer 6

candidates even =(

Answer 7

if you do proceed my way the second differences can't be 0
but any other number is fine...

Answer 8

The correct answer is C. It seems to be the one that makes most sense, right @myininaya @jdoe0001