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{The Derivative
Slope of a line, secant line, tangent line, slope of a secant line, slope of a line tangent to a curve
Lines, slope, point-slope form
What do we know about slopes of lines?
Lines, slope, point-slope form
Lines, slope, point-slope form
Lines, slope, point-slope form
Lines, slope, point-slope form
Given a curve, the line that intersects the curve on two points is called a secant line.
Secant line
Given a curve, the line that intersects the curve on two points is called a secant line.
Secant line
Tangent line
Given a non-linear curve, how do you get the slope of the curve at a the point (x, f(x) )?
Challenge question
Given a non-linear curve, how do you get the slope of the curve at a the point (x, f(x) )?
Challenge question
Let be the slope of the tangent line, then the slope of the curve at (x,f(x)) is the same as is the derivative of f at x. 𝑓 ′ (𝑥 )=𝑚𝑇𝐿
𝑦= 𝑓 (𝑥 )
How do we compute
Challenge question
How to find
(𝑥 𝑖 , 𝑓 (𝑥 𝑖 ) ) 𝑚𝑇𝐿=Δ𝑦Δ𝑥
=𝑦2− 𝑦1𝑥2−𝑥2
𝑓 ′ (𝑥 )= limΔ𝑥→ 0
𝑓 (𝑥+∆ 𝑥 )− 𝑓 (𝑥 )∆𝑥
Three step rule1. Find 2. Find
3. Evaluate
How to compute for
limΔ𝑥→0
𝑓 (𝑥+∆𝑥 )− 𝑓 (𝑥 )∆ 𝑥
How to compute for
First step
How to compute for
Second step
How to compute for
Third step
𝑓 ′ (𝑥 )=4 𝑥−3
What is
𝑓 ′ (2 )=4 (2 )−3=5
What is
𝑓 ′ (0 )=4 (0 )−3=−3