Question

Ajutor va rog am nevoie .Multumesc

Answer 1

ex.27. $x^{2} -5 x=x(x-5)$
ex.39.  2$x^{2}$+x-1=2(x+1/2)(x-1/2)=(2x+2)(x-1/2),deoarece
2$x^{2}$+x-1=0
Δ=b²-4ac=1=8=9
x.1=-b-radical dinΔ/2a=-1-3/4=-2\4=-1/2
x.2=-1+3/4=1/2
Ex.15
E(0)=1-1=0
E(-1)=0-0=0