Respuesta :

cantmember
f(x)= -2x-4 , x=-3

plug in -3, where ever x appears in the function 

f(-3)=-2(-3)-4

f(-3)=6-4  <-- remember two negatives make a positive when multiplied or divided.

f(-3)=2

........and since this is not an answer, are you sure you copied it down correctly? or can you answer non? 
remember order of operations
substitute -3 for x
[tex]f(-3)=-(-3)^2-4[/tex]
[tex]f(-3)=-(9)-4[/tex]
[tex]f(-3)=-9-4[/tex]
[tex]f(-3)=-13[/tex]

answer is A