Question

Considere a f:  r em r dada por f(x) =x ao quadrado -3x+4 . pede se;
f(2)
f(1/2)
f(-1)

Answer 1

f(x) = x²- 3x + 4

f(2) = 2² - 3.2 + 4 = 4 - 6 + 4 = 2
f(1/2) = 1/2² - 3.1/2² + 4 = 1/4 - 3.1/4 + 4 = 1/4 - 3/4 + 4 = 7/2
f(-1) = (-1)² - 3.(-1) + 4 = 1 - (-3) + 4 = 1 + 3 + 4 = 8