Question

Sendo f: R → R definida por f(x) = x² - 7x + 9 determine. F(1)-f(2)

Answer 1

Olá,

f(x)= x^2 - 7x +9

f(1)= 1^2 - 7.1 + 9

f(1)= 1 - 7 + 9

f(1)= 3

Agora resolvendo a Segunda...

f(2)= 2^2 - 7.2 + 9

f(2)= 4 - 14 + 9

f(2)=13 - 14

f(2)= -1

F(1)= 3 F(2)= -1

F(1) - F(2)

3 -(-1)

3+ 1= 4