Question

Sendo f uma função definida po f(x)= x ao quadrado -3x -10. Calcule.a) f (-1)b) f (0)c) f (3)d) f (5)e) f (1/2)

Answer 1

f(x) = x² - 3x - 10

a)
f(- 1) = (- 1)² - 3 (- 1) - 10
f(- 1) = 1 + 3 - 10
f(- 1) = 4 - 10
f(- 1) = - 6

b)
f(0) = 0² - 3 . 0 - 10
f(0) = 0 - 0 - 10
f(0) = - 10

c)
f(3) = 3² - 3 . 3 - 10
f(3) = 9 - 9 - 10
f(3) = - 10

d)
f(5) = 5² - 3 . 5 - 10
f(5) = 25 - 15 - 10
f(5) = 25 - 25
f(5) = 0

e)
f(1/2) = (1/2)² - 3 . 1/2 - 10
f(1/2) = 1/4 - 3/2 - 10
f(1/2) = (1 - 6 - 40)/4
f(1/2) = - 45/4