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Hello there I figured the first half, but then I got wrong on the second half

Hello there I figured the first half, but then I got wrong on the second half

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Given filnction isf [x}= —5x4 —3x3 + 7
:} f‘[x] = —20x3 — 9x2, f'[x} = 450% — 18x
For inflection point solve f “{x}: 0 for x as,
3 f“[x}= 02—50x2—18x= 0:}—fix[lflx+3}=...

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