a. x ( 6 - 4x) =0 ⇒ x=0 ; 6 -4x =0 ; x = 6/4 = 3/2
b. x² -7x +10 = 0 ⇒ ( x-5 ) · ( x -2) =0 x-5=0 ; x-2 =0 ; x=5 ; x=2
2 4x² + 4x+1 =0 ; ( 2x +1)² =0 ; 2x=-1 x = -1/2
3x² -x +2 =0 Δ = 1 - 4·3·2 = 1- 24 = -23 ecuatia nu are radacini
3
a . ( x -2) ·( x +2 )=0 ; x-2 =0 ; x+2 =0 ; x=2 ; x=-2
b. 2x² +3x =0 ; x( 2x +3) =0 ; x=0 ; 2x+3 =0 ; x = -3/2