1) (c^-8 * c^-9) / c^-4= c^(-8-9) / c^-4= c^-17 / c^-4= c^(-17+4)= c^-13= 1 / c^13
2) (c^-5 - 4) / c^-2= c^(-5) / c^-2 - 4 / c^-2= c^(-5+2) - 4c^2= c^-3 - 4c^2= 1/c^3 - 4c^2
1) (c^-8 * c^-9) / c^-4
= c^(-8-9) / c^-4
= c^-17 / c^-4
= c^(-17+4)
= c^-13
= 1 / c^13
2) (c^-5 - 4) / c^-2
= c^(-5) / c^-2 - 4 / c^-2
= c^(-5+2) - 4c^2
= c^-3 - 4c^2
= 1/c^3 - 4c^2