Question

Dada a função f(x)= -x²+5x+6 calcule.
A)f(-1)
B)f(√81)
C)f(2)
2

D)f(20)
10

E)f(-5)
F)f(√144)

Answer 1

Boa tarde

f(x) = -x² + 5x + 6

a) f(-1) = -1 - 5 + 6 = 0
b) f(9) = -81 + 45 + 6 = -30 
c) f(2)/2 = (-4 + 10 + 6)/2 = 12/2 = 6 
d) f(20)/10 = (-400 + 100 + 6)/10 = -294/10 = -29.4
e) f(-5) = -25 - 25 + 6 = -44 
f) f(12) = -144 + 60 + 6 = -78