Question

dada a funcao quadratica:f:R---->R definida por f(x)=x^2-6x+8 determine.

a)f(2). b)f(-3)

Answer 1

f(x) = x² - 6x + 8

a) f(2)

f(2) = 2² - 6 . 2 + 8
f(2) = 4 - 6 + 8
f(2) = 6



b) f(-3)
f(- 3) = 3² - 6 . 3 + 8
f(- 3) = 9 - 18 + 8
f( - 3) =  - 1