Definition of a Derivative Keeper 13 Honors Calculus
Understanding Functions Label the following on the picture below: 𝑓 𝑥 , 𝑓 𝑥+ℎ , ℎ, 𝑓 𝑥+ℎ −𝑓(𝑥) and a segment whose slope represents 𝑓 𝑥+ℎ −𝑓 𝑥 ℎ and lim ℎ→0 𝑓 𝑥+ℎ −𝑓 𝑥 ℎ
Slope of the Secant Line 𝑚 𝑠𝑒𝑐 = 𝑓 𝑥+ℎ −𝑓 𝑥 ℎ This formula represents the AVERAGE rate of change
Slope of the Tangent Line 𝑚 𝑡𝑎𝑛 = lim ℎ→0 𝑓 𝑥+ℎ −𝑓 𝑥 ℎ This formula represents the INSTANTANEOUS rate of change
Compare and Contrast the Average Rate of Change with the instantaneous rate of Change (derivative). Similarities Differences
Derivative Slope of a tangent line Rate of change at 1 point Instantaneous rate of change Denoted by 𝑦 ′ , f ′ x , or 𝑑𝑦 𝑑𝑥
Definition of a Derivative 𝑑𝑦 𝑑𝑥 = lim ℎ→0 𝑓 𝑥+ℎ −𝑓 𝑥 ℎ
Find the Derivative using the definition 1. 𝑓 𝑥 =−3𝑥+2
Find the Derivative 2. 𝑓 𝑥 = 3𝑥 2 −2𝑥+4
Find the Derivative 3. 𝑓 𝑥 = 1 𝑥+1
Find the Derivative 4. 𝑓 𝑥 = 𝑥−2