Let f (x) = x2 + 6 and g (x) = x+8/x. Find (g o f) (-7)

(g o f) (x) = g (f (x))

so

(g o f) (-7) = g (f (-7)) =

g ((-7) ^2+6) =

g (49+6) =

g (55) =

55+8/55=

55 ad 8/55

(g o f) (-7) = 55 and 8/55

(if you meant g (x) = (x+8) / x, then the result is 63/55 or 1 and 8/55)