Answer:
the polynomial function has 2 zeros
Explanation:
f(x) = 0
⇔ x⁴ - 4x = 0
⇔ x³ × (x) - 4 × (x) = 0
⇔ x × (x³ - 4) = 0
⇔ x = 0 or x³ - 4 = 0
⇔ x = 0 or x³ = 4
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