Concavity ●Definition O If fis differentiable on an open interval I,then f is said to be concave up on Tif f'is increasing on o fis said to be concave down on Iif f'is decreasing on IConcavity ⚫Definition  If f is differentiable on an open interval I, then f is said to be concave up on I if f ’ is increasing on I  f is said to be concave down on I if f ’ is decreasing on I