Find the absolute maximum and absolute minimum values of \( f \) on the given interval. \[ f(x)=2 x^{3}-6 x^{2}-48 x+5,[-3,5] \] absolute minimum
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To find the absolute maximum and absolute minimum values of the function \( f(x) = 2x^3 - 6x^2 - 48x + 5 \) on the interval \([-3, 5]\), we first need to determine the critical points by taking the derivative and setting it to zero. 1. **Derivative Calculation**: \[ f'(x) = 6x^2 - 12x - 48 \] 2. **Finding Critical Points**: Setting the derivative equal to zero: \[ 6x^2 - 12x - 48 = 0 \] Dividing the entire equation by 6 gives: \[ x^2 - 2x - 8 = 0 \] Factoring this, we get: \[ (x - 4)(x + 2) = 0 \] Therefore, the critical points are \( x = 4 \) and \( x = -2 \). 3. **Evaluate at Critical Points and Endpoints**: We need to evaluate \( f \) at the critical points and the endpoints of the interval \([-3, 5]\): - At \( x = -3 \): \[ f(-3) = 2(-3)^3 - 6(-3)^2 - 48(-3) + 5 = 2(-27) - 6(9) + 144 + 5 = -54 - 54 + 144 + 5 = 41 \] - At \( x = -2 \): \[ f(-2) = 2(-2)^3 - 6(-2)^2 - 48(-2) + 5 = 2(-8) - 6(4) + 96 + 5 = -16 - 24 + 96 + 5 = 61 \] - At \( x = 4 \): \[ f(4) = 2(4)^3 - 6(4)^2 - 48(4) + 5 = 2(64) - 6(16) - 192 + 5 = 128 - 96 - 192 + 5 = -155 \] - At \( x = 5 \): \[ f(5) = 2(5)^3 - 6(5)^2 - 48(5) + 5 = 2(125) - 6(25) - 240 + 5 = 250 - 150 - 240 + 5 = -135 \] 4. **Conclusion**: Now compare the values: - \( f(-3) = 41 \) - \( f(-2) = 61 \) - \( f(4) = -155 \) - \( f(5) = -135 \) The absolute maximum value is \( 61 \) at \( x = -2 \) and the absolute minimum value is \( -155 \) at \( x = 4 \). Thus, the absolute minimum value on the interval \([-3, 5]\) is \(\boxed{-155}\).
