Реши уравнение (y-3) *(4-y)=0

Question

Реши уравнение (y-3) *(4-y)=0

Comments

4у-у2-12-3у=0. у2+у=12. у(у+1)=12. у=12 . у=11

Answer 1

(y-3) * (4-y)=0
y-3=0 или 4-y=0
y=3           y=4

Answer 2

(y-3)*(4-y)=0
4y-y²-12+3y=0
y²-7y+12=0
D=49-48=1
y1=(7-1)/2=3
y2=(7+1)/2=4