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Hi please help me with this Math Calculus assignment it is about absolute extreme values i don’t understand

1)Given function is f x x 3 3x 2 24 x 12 f ‘ x 3x 2 6 x 24, f ” x 6 x 6 For critical points solve f ‘ x 0 for x as,
f ‘ x 0 3 x 2 6 x 24 0 3 x 4 x 2 0 x 4, 2 As f ” 4 18 0 so by second derivative…
Math