Tolong no 5 dan 8 nya.. sekalian pembahasannya

5. (B)
=  8/24 . p²⁻⁹. q⁶⁻².r⁵⁻⁷
= 1/3. p⁻⁷. q⁴. r⁻²
= (q⁴) / (3. p⁷.r²)

8. Jwb = A
f(x) =  (ax +b)/(cx +d)
f⁻¹ (x)= (dx -b)/(-cx + a)

f(x) = (x + 3)/(2x +1)
f⁻¹ (x) = (x - 3)/(- 2x +1)
atau
f ⁻¹(x) = (- x + 3)/(2x - 1) , x ≠ ¹/₂

No (5) 8p^2 q^6 r^5/24 p^9 q^2 r^7
=q^4 / 3p^7 r^2
(B)
No 8) f(x) =x+3/2x+1
F^-1(x) = -dx +b/cx-a
=-x+3/2x-1
(A)