suppose f(x)= sqrt of 1+3x, x>or equal to 5

k(x^2-5), x<5

for what value of k is continuous? For what value of k is f differentiable?

not even sure where to start i think i am on dealing with the second equation in this piecewise function

i know the answers are f is continuous if k=1/5 and f is differentiable if k=3/80