Question

Rezolvati ecuatiile!
a] x la a doua +5x+4=0
b] 2x la a doua +8 x+8=0
c]2x la a doua -12x+18=0
Va multumesc!

Answer 1

A) x^2+5x+4=0

(X+1)(x+4)=0

DC x+1=0=>x= -1

DC x+4=0=>X= -4

B) 2x^2+8x+8=0

2 (x^2+4+4)=0

(X+2)(x+2)=0=> x+2=0=>x= -2

C) 2x^2-12x+18=0

2 (x^2-6x+9)=0

(X-3)(x-3)=0=>x-3=0=>x=3