Question

dada a funcao f(x)=x2-5x+6 calcule : a) f(1). b)f(-1) c)f(2) d)f(3) e)f(0) f)f(1/2)

Answer 1

a) f(1)= 1.2-5.1+6=2-5+6=-3+6=3
b)f(-1)= (-1).2-5.(-1)+6= 2+5+6=13
c)f(2)= 2.2-5.2+6= 4-10+6=-6+6=0
d) f(3)= 3.2-5.3+6=6-15+6=-9+6=-3
e) f(0)=0.2-5.0+6=6 f)f(1/2)=1/2.2-5.1/2+6=2/2-5/2+6=1-2,5+6=-1,5+6=4,5

espero ter ajudado!

Answer 2

vc substitui tudo oq for X pelo numero pedido.

a-) 1.2-5.1+6               b-) -1.2-5.-1+6

      2-5+6                          -2-5=6

      -3+6                             -7+6

      f(1)= 3                           f(-1)= -1

c-) 2.2-5.2+6                      d-) 3.2-5.3+6 

     4-10+6                               6-15+6

      -6+6                                   -9+6

    f(2)= 0                                  f(3)= -3

e-) 0.2-5.0+6                    f-) 1/2. 2-5.1/2+6

    0-0+6                                1-0,25=6

  f(0)= 6                                  0,75+6

                                               f(1/2)= 6,75