Question

Dada a função f:R→R por f(x)= X2 + 2x, determine o valor de f(2) + f(3) -f(1): *
a)19
b)21
c)20
d(22

Answer 1

f(X) = X . 2 + 2 . X → f(2), f(3) e f(1):

f(1) = 1 . 2 + 2 . 1 = 4

f(2) = 2 . 2 + 2 . 2 = 8

f(3) = 3 . 2 + 2 . 3 = 12

f(2) + f(3) - f(1) = ?

8 + 12 - 4 = 16