Question

cum se rezolva ecuatia x^2 -3x=4
^ putere

Answer 1

[tex] x^{2} -3x=4 => x^{2} -3x-4=0 [/tex]
Calculam discriminantul: 
Δ=$(-3)^{2} -4*1*(-4)=25$.
Δ>0=> Avem 2 solutii reale distincte:
[tex]x1= \frac{-b+ \sqrt{delta} }{2a} , x2= \frac{-b- \sqrt{delta} }{2a} => x1= \frac{3+5}{2} =4, x2= \frac{3-5}{2} =-1[/tex]