jawab dong secepatnya

1.x (x+4)=0
x^2 +4x=0
2.y (2y-6)
2y^2 -6y=0
3.2x(x+7)
2x^2 +17x=0
4.5y(2y-5)
10y^2 -25y=0
5.(x+2)(x+5)
x^2 +5x+2x+10=0
x^2 +7x+10=0
6.(y-4)(y-9)
y^2 -9y-4y-36=0
y^2 -5y-36=0
12.(4+y)(7-3y)=0
28-12y+7y-3y^2=0
-3y^2+19y+28=0
13.(x+1/2)(x-9)=0
x^2-9x+1/2x-4,5=0
x^2-17/2x-4,5=0

quote=^2:pangkat 2