Question

let @x be defined as x^2+x for all integers x. If @b=0 how many possible values are there for b?

Answer 1

What do you think the answer is?

Answer 2

i have no idea

Answer 3

@b = 0
⇔ b^2 + b = 0
⇔ b(b+1) = 0
⇒ b = ....