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Find the 
x-coordinates of all relative minima of 
f(x).

f(x)=2x^(3)-15x^(2)+17
Answer: 
x=

Find the x x -coordinates of all relative minima of f(x) f(x) .\newlinef(x)=2x315x2+17 f(x)=2 x^{3}-15 x^{2}+17 \newlineAnswer: x= x=

Full solution

Q. Find the x x -coordinates of all relative minima of f(x) f(x) .\newlinef(x)=2x315x2+17 f(x)=2 x^{3}-15 x^{2}+17 \newlineAnswer: x= x=
  1. Find Derivative: To find the relative minima of the function f(x)f(x), we need to find the critical points by taking the derivative of f(x)f(x) and setting it equal to zero.\newlinef(x)=2x315x2+17f(x) = 2x^3 - 15x^2 + 17\newlineLet's find the first derivative f(x)f'(x).\newlinef(x)=ddx(2x315x2+17)f'(x) = \frac{d}{dx} (2x^3 - 15x^2 + 17)\newlinef(x)=6x230xf'(x) = 6x^2 - 30x
  2. Find Critical Points: Now we need to find the critical points by setting the derivative equal to zero and solving for xx.0=6x230x0 = 6x^2 - 30x0=6x(x5)0 = 6x(x - 5)This gives us two critical points: x=0x = 0 and x=5x = 5.
  3. 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).f(x)=ddx(6x230x)f''(x) = \frac{d}{dx} (6x^2 - 30x)f(x)=12x30f''(x) = 12x - 30
  4. Evaluate at Critical Points: Now we will evaluate the second derivative at the critical points to determine if they are relative minima.\newlineFor x=0x = 0:\newlinef(0)=12(0)30f''(0) = 12(0) - 30\newlinef(0)=30f''(0) = -30\newlineSince f''(0) < 0, the function is concave down at x=0x = 0, which means x=0x = 0 is not a relative minimum.
  5. Conclusion: For x=5x = 5:f(5)=12(5)30f''(5) = 12(5) - 30f(5)=6030f''(5) = 60 - 30f(5)=30f''(5) = 30Since f''(5) > 0, the function is concave up at x=5x = 5, which means x=5x = 5 is a relative minimum.

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