Question

Seja "f" a função dada por y= x²+ x +1. Calcule f(1) - f(2) - f(3) + f(4).

Answer 1

y= x²+ x +1

f(1) =1²+1+1
f(1) =1+1+1
f(1) =3

f(2) =2²+2+1
f(2) =4+2+1
f(2) =6+1
f(2) =7

f(3) =3²+3+1
f(3) =9+3+1
f(3) =13

f(4) =4²+4+1
f(4) =16+4+1
f(4) =21

f(1) - f(2) - f(3) + f(4) = 3 - 13 -7 + 21 = 4