Question

dada a função f(x) = -5x+7, calcule
f(x) = 9. f(x) = 1/2. f(x) = -5/3

Answer 1

F(x)=-5x+7

I) F(x)=9
-5x+7=9 -> -5x=2 -> x=-2/5

II) F(x)=1/2
-5x+7=1/2 -> -5x= 1/2-7 -> -5x=13/2 ->x=-13/10 = -1,3

III) F(x)= -5/3
-5x+7=-5/3 -> -5x=-5/3-7 -> -5x=-26/3 -> x=26/15

Answer 2

f(9)= -5.9+7=0
-45+7= -38

f(1/2)= -5.1/2+7
-5/2+7 =
2/2= 1

f(-5/3)
-5.(-5/3)+7=
-25/3+7= 
-18/3
=-6