human
Find the nth term rule for ascending quadratic sequences in the form x² + bx + c \(10,21,34,49,66, \ldots\)

When calculating the nth-term rule of this sequence, 
what should replace the triangle?

nth-term rule: \( n^{2} \)\( \color{red}\triangle \)  \(n\) \( \color{purple}\square \) \( -8 \)
gpt
When finding the differences between terms in a sequence, believes they can do so from right to left 