lizbethn98 lizbethn98 11-04-2018 Mathematics contestada Determine ƒ(–a) where ƒ(x) = x2– 6x and simplify. ƒ(–a) = a2 – 6a ƒ(–a) = –a2 + 6a ƒ(–a) = a2 + 6a ƒ(–a) = –a2 – 6a