Zadanie 2
a)
x^2=6x
x^2-6x=0
x(x-6)=0
x=0
lub
x-6=0
x=6
b)
y^2=-7y
y^2+7y=0
y(y+7)=0
y=0
lub
y+7=0
y=-7
c)
z^2=9z
z^2-9z=0
z(z-9)=0
z=0
lub
z-9=0
z=9
d)
x^2=\frac{8}{9}x |*9
9x^2=8x
9x^2-8x=0
x(9x-8)=0
x=0
lub
9x-8=0
9x=8
x=\frac{8}{9}
e)
y^2=-\frac{7}{8}y |*8
8y^2=-7y
8y^2+7y=0
y(8y+7)=0
y=0
lub
8y+7=0
8y=-7
y=-\frac{7}{8}
f)
z^2=\frac{14}{5}z
z^2=2,8z
z^2-2,8z=0
z(z-2,8)=0
z=0
lub
z-2,8=0
z=2,8
g)
x^2=0,3x
x^2-0,3x=0
x(x-0,3)=0
x=0
lub
x-0,3=0
x=0,3
h)
y^2=-1,7y
y^2+1,7y=0
y(y+1,7)=0
y=0
lub
y+1,7=0
y=-1,7
i)
z^2=14,2z
z^2-14,2z=0
z(z-14,2)=0
z=0
lub
z-14,2=0
z=14,2