Respuesta :
When asking for f(-5) or any other number, they are asking you to plug in that number for x.
So, f(-5) = 6(-5) - 3
f(-5) = -30 - 3
f(-5) = -33
So, f(-5) = 6(-5) - 3
f(-5) = -30 - 3
f(-5) = -33