4.
(a) You just plug x = -1 into the function and work it out:-
(x) = x^2 - 4 so f(-1) = (-1)^2 - 4 = - 4 = -3 (answer)
b, and c are worked out in the same way.
5. g(5) + g(-2) = 12 - 5(5) + 12 - 5(-2) = 24 - 25 + 10 = 9 answer
(b) g(k) = 12 - 5k = 14
12-5k = 14
5k = -2
k = -2/5 answer
