Question

si f(x) = (x(x-1))/2 entonces f(x +2) es igual a?

Answer 1

f(x) = (x(x - 1))/2
f(x) = (x² - x))/2 

f(x + 2) = ((x + 2)² - (x + 2))/2
= (x² + 4x + 4 - x - 2)/2
= (x² + 3x + 2)/2
= (x + 2)(x + 1)/2