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4.1 Linear Approximations Mon Dec 21 Do Now Find the equation of the tangent line of each function at 1) Y = sinx 2) Y = cosx
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Quiz Review Retakes this week
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Differentials We define the values as the difference between 2 values These are known as differentials, and can also be written as dx and dy
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Linear Approximations The tangent line at a point of a function can be used to approximate complicated functions Note: The further away from the point of tangency, the worse the approximation
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Linear Approximation of df If we’re interested in the change of f(x) at 2 different points, we want If the change in x is small, we can use derivatives so that
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Steps 1) Identify the function f(x) 2) Identify the values a and 3) Use the linear approximation of
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Ex 1 Use Linear Approximation to estimate
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Ex 2 How much larger is the cube root of 8.1 than the cube root of 8?
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Ex 3,4 In the book bc lots to type
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You try 1) Estimate the change in f(3.02) - f(3) if f(x) = x^3 2) Estimate using Linear Approximation
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Linearization Again, the tangent line is great for approximating near the point of tangency. Linearization is the method of using that tangent line to approximate a function
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Linearization The general method of linearization 1)Find the tangent line at x = a 2)Solve for y or f(x) 3)If necessary, estimate the function by plugging in for x The linearization of f(x) at x = a is:
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Ex 1 Compute the linearization of at a = 1
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Ex 2 Find the linearization of f(x) = sin x, at a = 0
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Ex 3 Find the linear approximation to f(x) = cos x atand approximate cos(1)
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Closure Journal Entry: Use Linearization to estimate the square root of 37 HW: p.214 #1, 5, 9, 13, 17-33 odds,37 45 47 49, 53-63 odds
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Linear Approximation Review Tues Dec 22 Do Now Use linear approximations to estimate
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HW Review p.214
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Linearization Review We can use linear approximation (tangent line equations) for 2 uses: 1) Find the difference between two values of f(x) 2) Estimate the value of f(x) at specific points
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Closure Find the linearization of f(x) = 1/x at a = 2 HW: Retry hw problems
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