Question

(x+2)^2=x(3x+2) va rog

Answer 1

x²+4x+4=3x²+2x
2x²-2x-4=0
2(x²-x-2)=0
x²-x-2=0
x1,2=[1+/-√(1+8)]/2=(1+/-3)/2
x1=-1, x2=2

sau prin descompunere (daca nu ai invatat formula inca)
x²-x-2=x²-2x+x-2=x(x-2)+(x-2)=(x-2)(x+1)=0
x-2=0, x=2
x+1=0, x=-1

S={-1, 2}