Find the Taylor polynomial p3(x) for f(x)=x1/3 at x=3 .
Question
Find the Taylor polynomial p3(x) for f(x)=x1/3 at x=3 .
Solution 1
The Taylor polynomial of degree n for a function f(x) at a point x=a is given by:
Pn(x) = f(a) + f'(a)(x-a) + f''(a)(x-a)^2/2! + ... + f^n(a)(x-a)^n/n!
Here, we want to find the Taylor polynomial of degree 3, P3(x), for the function f(x) = x^(1/3) at x = 3.
First, we need to find the first, second, and third derivatives of f(x) = x^(1/3).
f'(x) = (1/3)x^(-2/3)
f''(x) = -(2/9)x^(-5/3)
f'''(x) = (10/27)x^(-8/3)
Now, we evaluate these at x = 3:
f(3) = 3^(1/3) = 1.44224957
f'(3) = (1/3)3^(-2/3) = 0.19245009
f''(3) = -(2/9)3^(-5/3) = -0.04246712
f'''(3) = (10/27)3^(-8/3) = 0.01282051
Now, we can plug these values into the Taylor polynomial formula:
P3(x) = f(3) + f'(3)(x-3) + f''(3)(x-3)^2/2! + f'''(3)(x-3)^3/3!
P3(x) = 1.44224957 + 0.19245009(x-3) - 0.04246712(x-3)^2/2 + 0.01282051(x-3)^3/6
This is the Taylor polynomial of degree 3 for the function f(x) = x^(1/3) at x = 3.
Solution 2
The Taylor polynomial of degree n for a function f(x) at a point x=a is given by:
Pn(x) = f(a) + f'(a)(x-a) + f''(a)(x-a)^2/2! + ... + f^n(a)(x-a)^n/n!
Here, we want to find the Taylor polynomial of degree 3, P3(x), for the function f(x) = x^(1/3) at x = 3.
First, we need to find the first, second, and third derivatives of f(x) = x^(1/3).
f'(x) = (1/3)x^(-2/3)
f''(x) = -(2/9)x^(-5/3)
f'''(x) = (10/27)x^(-8/3)
Next, we evaluate these derivatives at x = 3:
f(3) = 3^(1/3) = 1.44224957
f'(3) = (1/3)3^(-2/3) = 0.19245009
f''(3) = -(2/9)3^(-5/3) = -0.04246712
f'''(3) = (10/27)3^(-8/3) = 0.01249038
Finally, we substitute these values into the Taylor polynomial formula:
P3(x) = f(3) + f'(3)(x-3) + f''(3)(x-3)^2/2! + f'''(3)(x-3)^3/3!
P3(x) = 1.44224957 + 0.19245009(x-3) - 0.04246712(x-3)^2/2 + 0.01249038(x-3)^3/6
This is the Taylor polynomial of degree 3 for the function f(x) = x^(1/3) at x = 3.
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