Question

If f(x)=x2 then f(x+1)-f(x-1)=

Answer 1

$f(x) = 2$

$f(x + 1) - f(x - 1) = (2 + 1) - (2 - 1)$

$(2 + 1) - (2 - 1) = 3 - 1$

$= 2$

$f(x + 1) - f(x - 1) = 2$