ok so for this problem we need to write the answer in interval notation, and in the answer key its [-5/3,2] and i understand

Question

ok so for this problem we need to write the answer in interval notation, and in the
answer key its [-5/3,2] and i understand where the points came from and why its
using brackets but why doesn't it use union? like (-infini, -5/3]U[2, infini) (edited)
4. 3x²-x-10 ≤0

Kunduz · Accepted Answer

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