Find the absolute extrema of the function on the closed interval. y = 3x2/3 − 2x, [−1, 1]
y'=2x^-1/3-2=0, u get x^1/3=1, so x=1, then y=1, but interval [-1,1], we have 3 values of x:-1,0,1
x=1 so y=1, x=0 so y=0, x=-1 so y=5 To get the extrema, derive the function. You get y' = 2x^-1/3 - 2. Set this equal to zero, and you get x=0 as the location of a critical point. Since you are on a closed interval [-1, 1], those points can also have an extrema
X=1 min at (0,0) max at (-1,5)
The absolute minimum is "(0, 0)" and absolute maximum is "(-1, 5)".
Given:
Now,
→ \(\frac{dy}{dx} = 2x^{-\frac{1}{3} } -2\)
\(= \frac{2}{x^{\frac{1}{3} }} -2\)
\(= \frac{2[1-x^{\frac{1}{3} }]}{x^{\frac{1}{3} }}\)
Critical point,
By evaluating the function values at the critical point,
\(x =0\)
→ \(f(0) =0\)
\(x =-1\)
→ \(f(-1) = 3+2\)
\(= 5\)
\(x =1\)
→ \(f(1) = 3-2\)
\(= 1\)
Thus the above answer is correct.
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