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{x-6≥0
{x²-3x-4≥0
se determina radacinile fiecarei functii in parte
1) x+4=0⇒x=-4
2)x-6=0⇒x=6
3)x²-3x-4=0⇒xunu=-1 si xdoi=4
facem taelul cu semnul celor trei functii
x -α -4 -1 4 6 +α
1)a=1>0 x+4(>0) - - - - - - - - 0++++++++++++++++++++++++
2)a=1>0 x-6(≥)0 - - - - - - - - - - - - - -- - - - - - - - - - - - - - - 0++++++++
3)a=1>0 x²-3x-4(≥0) +++++++++++++++0- - - - - 0+++++++++++++++++
⇒x∈[6, +α]