Question

Dada a função polinomial do 2º grau f(x) = x² - 4x + 6 calcule:

A) f(-2)=
B) f(3)=
C) f(0)=
D) f(3/4)=
F) (-1/2)=

Answer 1

a) f(-2) = (-2)² - 4(-2) + 6 = 4 +8 +6 = 18
b)f(3) = 3² - 4.3 + 6 = 9 - 12 + 6 = 3
c)f(0) = 0² - 4.0 + 6 = 6
d)f(3/4) = (3/4)² - 4.3/4 + 6 = 9/16 - 3 + 6 = 9/16 - 48/16 + 96/16 = 57/16
e)f(-1/2) = (-1/2)² - 4(-1/2) + 6 = 1/4 + 2 + 6 = 1/4 + 8/4 + 24/4 = 33/4