Give the answer in the form of numeric interval [a, b]

Solve the inequality (1 – 3x) (2x – 5) ≤ 0. [Barufi e Lauro, 2001]

The solution to this exercise is a set of “values of independent varible x that make the product of values used by both functions be negative or zero”.    The analysis of graphics and some intuition allow us to identify both intervals, parts of the expected answer to question (highlighted in orange): x ≤ 1/3 e x ≥ 2.5   In iGraf, this answers must be written, respectively, in the form: ] – i, 0.33 ]  e  [ 2.5, i [    Try it... select  Exercíse ! Answer / Send option and test your solutions.