👤

Determinati x apartine lui R pentru care (3x+4)la patrat = (2x+1)la patrat

Răspuns :

(3x+4) la patrat= 9x la patrat + 24x +16 (2x+1) la patrat= 4x la patrat + 4x+ 1 9x la patrat + 24 x +16 = 4x la patrat +4x+1 5x la patrat + 20x = -15 5x la patrat+ 20x+15=0 5x la patrat+ 5x+ 15x+15=0 5x(x+1)+15(x+1)=0 (5x+15)(x+1)=0 5x+15=0 5x=-15 x=-3 x+1=0 x=-1