The problem: Find the value of b that makes the function differentiable.

f(x) =

ax^2 + 10, x>2

x^2 -6x +b, x < 2

It is a peicewise function just incase that doesn't look right to someone.

I have attempted setting both functions equalto one another but all I ended up with was b-4a = 2 and I am stuck after that.