Question

Se f(x)=x² - 5x + 6, então o valor de f(3) é:
a) 2
b) 3
c) 4
d) 0
e) 5

Answer 1

$f(x) = x^2 - 5x + 6\\f(3) = 3^2 - 5 * 3 + 6\\f(3) = 9 - 15 + 6\\f(3) = 15 - 15\\f(3) = 0$

Answer 2

f(x)= x² - 5x + 6

f(3)= 3² - 5 • 3 + 6

f(3)= 9 - 15 + 6

f(3)= - 6 + 6

f(3)= 0