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The derivative of the function 
f is defined by 
f^(')(x)=x^(2)-3x+3sin(2x+1). Find the 
x values, if any, in the interval 
-2.5 < x < 2.5 where the function 
f has a relative minimum. You may use a calculator and round all values to 3 decimal places.
Answer: 
x=

The derivative of the function f f is defined by f(x)=x23x+3sin(2x+1) f^{\prime}(x)=x^{2}-3 x+3 \sin (2 x+1) . Find the x x values, if any, in the interval \( -2.5

Full solution

Q. The derivative of the function f f is defined by f(x)=x23x+3sin(2x+1) f^{\prime}(x)=x^{2}-3 x+3 \sin (2 x+1) . Find the x x values, if any, in the interval 2.5<x<2.5 -2.5<x<2.5 where the function f f has a relative minimum. You may use a calculator and round all values to 33 decimal places.\newlineAnswer: x= x=
  1. Find Critical Points: To find the relative minimum of the function ff, we need to find the critical points of ff by setting its derivative f(x)f'(x) equal to zero and solving for xx. The derivative is given by f(x)=x23x+3sin(2x+1)f'(x) = x^2 - 3x + 3\sin(2x+1).
  2. Set Derivative Equal: Set the derivative equal to zero to find the critical points: x23x+3sin(2x+1)=0x^2 - 3x + 3\sin(2x+1) = 0. This equation cannot be solved algebraically due to the presence of the sine function, so we will use a calculator to find the solutions within the interval -2.5 < x < 2.5.
  3. Graph Function: Using a calculator, we graph the function y=x23x+3sin(2x+1)y = x^2 - 3x + 3\sin(2x+1) and look for the xx-values where the graph crosses the xx-axis within the interval -2.5 < x < 2.5. These xx-values are the critical points where ff could have a relative minimum.
  4. Find XX-Values: After graphing, we find that the function crosses the xx-axis at certain points. We use the calculator's feature to find the exact xx-values to three decimal places.
  5. Test Critical Points: Suppose the calculator gives us one or more xx-values where the function crosses the xx-axis. We then need to test these xx-values to determine if they correspond to relative minima. We do this by using the first or second derivative test.
  6. First Derivative Test: For the first derivative test, we look at the sign of f(x)f'(x) just before and after each critical point. If f(x)f'(x) changes from negative to positive at a critical point, then ff has a relative minimum at that point.
  7. Second Derivative Test: For the second derivative test, we would find f(x)f''(x) and evaluate it at the critical points. If f(x)f''(x) is positive at a critical point, then ff has a relative minimum at that point. However, since the second derivative involves the cosine function and is more complex, we will use the first derivative test.
  8. Apply First Derivative Test: After applying the first derivative test to the critical points found, we determine which of them are relative minima. We list these xx-values as the answer.

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