Find the open intervals where fis increasing or decreasing. f(x) = −x³ + 2x² + 15x + 16 f(x) = 16 9 -3x Find the locations and values of all relative maxima and minima. f(x) = 2x² - 8x + 1 f(x) = 2x³ + 3x² - 36x + 20

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A: x=4i+2j​−ky​=−3i+5j​+4kz=−i−j​+2k  ∣∣∣​2x+2y​−z∣∣∣​=∣∣∣​3i+15j​+4k∣∣∣​=32+152+42​=250​≈15.811

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