Question

Which of the following number sequences could be produced by the expression `2x + x^2`?


correctA. 3, 8, 15, 24


B. 1, 3, 5, 7


C. 1, -1, -3, -5


D. 2, 7, 14, 21

Answer 1

2(1)+(1)^2
2+1
=3
2(2)+(2)^2
4+4
=8

Answer 2

You had me with 2*1+1^2 = 3

since A was the only sequence starting with 3.

Answer 3

what made you think of 1