Question

dada a funçao f(x)=x²-x determine f(5)+f(½)

Answer 1

f(x) = x² - x              f(1/2) = (1/2)² - 1/2
f(5) = 5² - 5              f(1/2) = 1/4 - 1/2
f(5) = 25 - 5             f(1/2) = (1-2)/4
f(5) = 20                  f(1/2) = -1/4

f(5) + f(1/2)
20 + (-1/4)
20 - 1/4
(80-1)/4
79/4
[19,75]