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The derivative of the function 
f is defined by 
f^(')(x)=x^(2)+2x-3sin(3x). Find the 
x values, if any, in the interval 
-2.5 < x < 3 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)=x2+2x3sin(3x) f^{\prime}(x)=x^{2}+2 x-3 \sin (3 x) . 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)=x2+2x3sin(3x) f^{\prime}(x)=x^{2}+2 x-3 \sin (3 x) . Find the x x values, if any, in the interval 2.5<x<3 -2.5<x<3 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. Identify Critical Points: Identify the critical points of the function ff by setting its derivative f(x)f'(x) equal to zero and solving for xx.f(x)=x2+2x3sin(3x)=0f'(x) = x^2 + 2x - 3\sin(3x) = 0This is a transcendental equation and may not have an algebraic solution. We will use a calculator to find the roots in the interval -2.5 < x < 3.
  2. Find Zero of Derivative: Use a graphing calculator or numerical methods to find the approximate values of xx where f(x)=0f'(x) = 0 in the given interval.\newlineBy graphing or using a numerical solver, we can find the xx values that make the derivative zero. These xx values are the potential points where ff could have a relative minimum or maximum.
  3. Determine Relative Minimum: Determine whether each critical point is a relative minimum by using the second derivative test or the first derivative test.\newlineFor the second derivative test, we would find f(x)f''(x) and evaluate it at the critical points. If f''(x) > 0, then ff has a relative minimum at that point. If f''(x) < 0, then ff has a relative maximum at that point.\newlineAlternatively, for the first derivative test, we would look at the sign of f(x)f'(x) 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.
  4. Calculate Second Derivative: Use the calculator to find the second derivative of ff, if necessary, and evaluate it at the critical points found in Step 22.\newlineSince the second derivative of ff involves the derivative of 3sin(3x)-3\sin(3x), which is 9cos(3x)-9\cos(3x), the second derivative f(x)f''(x) will be f(x)=2x+29cos(3x)f''(x) = 2x + 2 - 9\cos(3x).\newlineWe can then use the calculator to evaluate f(x)f''(x) at each critical point to determine if it is a relative minimum.
  5. Report Minimum Values: Report the xx values where ff has a relative minimum, rounding to three decimal places as instructed.\newlineAfter evaluating the second derivative at the critical points or using the first derivative test, we can identify the xx values where ff has a relative minimum. These values should be within the interval -2.5 < x < 3.

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