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4x²+3x=1 , multimea nr reale

Răspuns :

ECUATIE DE GRADUL AL DOILEA CAND AI ASA FACI

4x²+3x-1=0
Δ=9+16=25
x1=(-3+5)/8=2/8=1/4
x2=(-3-5)/8=-8/8=-1
x∈{-1,1/4}