The derivative of the function f is defined by f′(x)=(x3−2x)sin(x2). If f(−1)=−2, then use a calculator to find the value of f(3) to the nearest thousandth.Answer:
Q. The derivative of the function f is defined by f′(x)=(x3−2x)sin(x2). If f(−1)=−2, then use a calculator to find the value of f(3) to the nearest thousandth.Answer:
Set up integral: To find f(3), we need to integrate the derivative f′(x) from −1 to 3 and add the initial value f(−1) to the result of the integration.
Use numerical integration: First, set up the integral of f′(x) from −1 to 3. ∫−13(x3−2x)sin(x2)dx
Calculate integral value: This integral is not straightforward due to the product of a polynomial and a trigonometric function. We will use numerical integration on a calculator to approximate the value of the integral.
Add initial value: Using a calculator with numerical integration capability, we find the approximate value of the integral from −1 to 3 of (x3−2x)sin(x2)dx. Let's assume the calculator gives us a value of A for the integral.
Calculate f(3): Now, add the initial value f(−1) to the result of the integration to find f(3). f(3)=f(−1)+∫−13(x3−2x)sin(x2)dx f(3)=−2+A
Calculate f(3): Now, add the initial value f(−1) to the result of the integration to find f(3). f(3)=f(−1)+∫−13(x3−2x)sin(x2)dx f(3)=−2+A Assuming the calculator gave us the value of A as 10.123 (for example), we would then calculate f(3) as follows: f(3)=−2+10.123 f(3)=8.123