Question

f(x) = 2x² + 5x +3
a) Calcule f(0):
b) Calcule f(2):
c) Calcule f(-3):

Answer 1

Basta substituir o x:

a) f(x) = 2x² + 5x +3

f(0) = 2 . 0² + 5 . 0 + 3

f(0) = 2 . 0 + 0 + 3

f(0) = 0 + 0 + 3

f(0) = 3

b) f(x) = 2x² + 5x +3

f(2) = 2 . 2² + 5 . 2 + 3

f(2) = 2 . 4 + 10 + 3

f(2) = 8 + 10 + 3

f(2) = 18 + 3

f(2) = 21

c) f(x) = 2x² + 5x +3

f(-3) = 2 . (-3)² + 5 . (-3) + 3

f(-3) = 2 . 9 + (-15) + 3

f(-3) = 18 - 15 + 3

f(-3) = 3 + 3

f(-3) = 6