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Find inflection points

AP.CALC: FUN‑4 (EU), FUN‑4.A (LO), FUN‑4.A.4 (EK), FUN‑4.A.5 (EK), FUN‑4.A.6 (EK)
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Problem

Let h, left parenthesis, x, right parenthesis, equals, x, start superscript, 4, end superscript, minus, 20, x, cubed, plus, 150, x, squared.
For what values of x does the graph of h have a point of inflection?
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