Let f be a differentiable function such that f(3) = 2.345 and f' (x) = ln (x^2+ 1). What is the value of f (5)?
A) 3.301
B) 5.631
С) 6.950
D) 7.976

Respuesta :

Use a linear approximation to [tex]f(x)[/tex] centered at [tex]x=3[/tex]:

[tex]f(x)\approx f(3) + f'(3)(x-3)[/tex]

Then

[tex]f(5)\approx2.345+\ln(3^2+1)(5-3)\approx6.95[/tex]

which makes C the most likely choice.

Here we want to solve the differential equation, by finding the Taylor expansion of the function and evaluation we will find that f(5) = 6.950, so the correct option is C.

Taylor series the equation:

Here we must start by doing a Taylor expansion of the function, remember that the Taylor expansion is given by:

f(x) = f(a) + f'(a)*(x - a) + ...

The series has more terms, but we can work with two to get an estimation, if we use a = 3 we get:

f(x) = f(3) + ln(3^2 + 1)*(x - 3) = 2.345 + ln(10)*(x - 3)

Now we evaluate this in x = 5 to get:

f(5) = 2.345 + ln(10)*(5 - 3) = 6.950

So the correct option is C.

If you want to learn more about Taylor series, you can read:

https://brainly.com/question/9211177