Question

Dada a funçao y=x² - 9
a) f(3)
b f(-3)
c f(√2)
d f(5)

Answer 1

a) f(3)= 3²-9
    f(3)=9-9 =0

b) f(-3)=-3²-9
     f(-3)= 9-9=0

c) f(√2) = √2² -9
    f (√2) = √4 -9
    f(√2) = 2 - 9 = 7

d) f (5)=5²-9
    f(5)=25-9=16