3a²-18ab-2b²+18ab=3a²-2b²=3*9-2*4=27-8=19
1)mˇ3 +6mˇ2 -m -6=0
mˇ2(m+6) - (m+6) =0
(m+6)(mˇ2-1)=0
(m+6)(m+1)(m-1)=0
m1=-6,m2=-1,m3=1
2)xˇ3-5xˇ2-16x+80=0, xˇ2(x-5)-16(x-5)=0
(x-5)(xˇ2 -16)=0, (x-5)(x+4)(x-4)=0
x1=5,x2=-4, x3=4
3)1/8-1/4p -1/2pˇ2 +pˇ3=0
pˇ2(p-1/2)-1/4(p-1/2)=(p-1/2)(pˇ2-1/4)=(p-1/2)(p+1/2)(p-1/2)=
p1=1/2,p2=-1/2,p3=1/2=p1
4)27m-90=3mˇ3-10mˇ2
mˇ2(3m-10)-9(3m-10)=0, (3m-10)(mˇ2-9)=0=(3m-10)(m+3)(m-3)=0
m1=10/3, m2=-3, m3=3
1) a^3-3a^2b+3ab^2-b^3-(a-b)^2
2) (x+y)^2-x^3+3x^2y+3xy^2+y^2
3) a^2-b^2-a^3-3a^2b+3ab^2-b^3
4)m^3-6m^2n+12mn^2-8n^3-m^2+4n^2
5)c^2-4cy+4y^2+(c-2y)^3
6)x^2-6xy+9y^2-(x-3y)^3