Question

Dada a função f(x)= -x²+5x+6, calcule:
a) f(-3)
b) f(7)
c) f(0)
d) f(√2)

Answer 1

a)
f(-3)= -(-3²)+5.(-3)+6
f(-3)=-(9)-15+6
f(-3)= -9-15+6
f(-3)= -18

b)
f(7)= -7²+5.7+6
f(7)= 49+35+6
f(7)= 90

c)
f(0)= -0²+5.0+6
f(0)= 0+0+6
f(0)= 6

d)
f(√2)= -√2²+5.√2+6
f(√2)= -√4+5.√2+6
f(√2)= -2+5.√2+6
f(√2)= 3.√2+6
f(√2)=9.√2