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Laviandre
a fost răspuns

Sa se rezolve inecuatia (2x-1)^2<sau egal 9

Răspuns :

Albatran

(2x-1)²-9≤0
(2x-1)²-3²≤0
(2x-1-3)(2x-1+3)≤0
(2x-4)*(2x+2)≤0
2(x-2)*2(x+1)≤0
(x-2)(x+1)≤0
x²-x-2≤0...functie de grad 2 cu a=1>0
deci
x∈[-1;2]
as simple as that!!!