Gimana cara ngerjainnya? tlg kasi tau kak

f(x) = 5x-2
g(x) = x+2
h(x) = x²+x-3
(hofog) (a) = hof (g(a))
9 = hof (a+2)
9 = h(f(a+2))
9 = h (5(a+2)-2)
9 = h (5a+10-2)
9 = h (5a+8)
9 = (5a+8)²+(5a+8)-3
9 = 25a²+80a+64+5a+8-3
9 = 25a²+75a+69
9-69 = 25a²+75a
-60 = 25a²+75a
_____________:5
-12 = 5a²+15a