Question

dada a função f: r→ r, definida por f(x)=x2-2x-1
a) f(-2)=
b) f(0)=
c) f(1)=
d) f(3)=

Answer 1

f(x)=x²-2x-1

a)
f(-2)=(-2)²-2(-2)-1
f(-2)=4+5-1
f(-2)=9-1
f(-2)=8

b)
f(0)=-1


c)
f(1)= 1²-2*1-1
f(1)=1-2-1
f(1)=-2

d)
f(3)=3²-2*3-1
f(3)=9-6-1
f(3)=2