Question

dada a funçao f(x) = x²-4x-5 determine o que se pede:
a) f (1) b) f (3) c) f(0) d) f (1/3)

Answer 1

a)
${1}^{2} - 4(1) - 5 = 1 - 4 - 5 = - 8$
b)
${3}^{2} - 4(3) - 5 = 9 - 12 - 5 = - 8$
c)
${0}^{2} - 4(0) - 5 = - 5$
d)
${( \frac{1}{3} )}^{2} - 4( \frac{1}{3} ) - 5 = \frac{1}{9} - \frac{4}{3} - 5 \\ = \frac{1}{9} - \frac{8}{9} - 5 = - \frac{52}{9}$