Question

f(x)=×2+×-6 gente me ajuda
Nessa

Answer 1

a) f (-3) = -2(-3) - 6 ==> 6-6= 0

b) f (0)= -2(0) - 6 ==> - 6

c) f (x) = - 25 => -2x - 6 = - 25 => -2x= -25+6=> -2x = - 19(-1)=>2x= 19

=>x= 19/2 

d) f (x) = 0 =>= -2x-6=0=> -2x = 6(-1)=>2x = - 6 ==> x = - 3

 

e) f (-1/3)= -2(-1/3) - 6

==> 2 - 6 ==> 2 - 18 ==> - 16

      3                3              3

f) f (x) = 1/4 ==> -2x - 6 = 1      mmc =4

                                     4

-8x - 24 = 1 ==> -2x = 1 + 24 ==> -2x = 25(-1) ==> 2x = - 25

x = - 25

        2