Question

COROANA!!!!!!!!!!!!!!Rezolvati in multimea numerelor reale , ecuatia 4x² +3x=1

Answer 1

4x^2+3x=1
4x^2+3x-1=0
Coeficientii:
A=4
B=3
C=-1
Δ=b^2-4ac=3^2-4*4*(-3)=9+16=25
Δ>0
x=(-b+/-√Δ)/2a
√Δ=√25=5
2a=2*4=8
-b=-3
x1=(-3+5)/8=2/8=1/4
x2=(-3-5)/8=-8/8=-1
x∈R
S={1/4,-1}