Q. Find the x-coordinates of all relative minima of f(x).f(x)=2x3−15x2+17Answer: x=
Find Derivative: To find the relative minima of the function f(x), we need to find the critical points by taking the derivative of f(x) and setting it equal to zero.f(x)=2x3−15x2+17Let's find the first derivative f′(x).f′(x)=dxd(2x3−15x2+17)f′(x)=6x2−30x
Find Critical Points: Now we need to find the critical points by setting the derivative equal to zero and solving for x.0=6x2−30x0=6x(x−5)This gives us two critical points: x=0 and x=5.
Second Derivative Test: To determine whether these critical points are relative minima, we need to use the second derivative test or the first derivative test. Let's find the second derivative of f(x).f′′(x)=dxd(6x2−30x)f′′(x)=12x−30
Evaluate at Critical Points: Now we will evaluate the second derivative at the critical points to determine if they are relative minima.For x=0:f′′(0)=12(0)−30f′′(0)=−30Since f''(0) < 0, the function is concave down at x=0, which means x=0 is not a relative minimum.
Conclusion: For x=5:f′′(5)=12(5)−30f′′(5)=60−30f′′(5)=30Since f''(5) > 0, the function is concave up at x=5, which means x=5 is a relative minimum.
More problems from Find the roots of factored polynomials