need help showing work and solving for limits

3, x5 - 2 f ( x) = Vx2 +5, -24 a.) lim f(x) = x- -2 d.) lim f(x) = x-4 b.) lim f(x) = x- -2+ e.) lim f(x) = x-4+ c.) lim f(x) = x--2 f.) limf(x) = X-4