The children are talking about their families. Choose the correct word (a, b or c) to fill in the gaps in the sentences. There is an example (0) at the beginning.

(2p-3n)(2p+3n)-4p(p-n)= 4p^2-9n-4p^2+4pn=4pn-9n

3xy+3x^2y=3xy(1+x)
x(x-1)+2(x-1)=(x-1)(x+2)
x^2-25y^2=(x-5y)(x+5y)
a-ax^2=a(1-x^2)

==a-1

x(2x+14)=0
2x^2+14x=0
2x(x+14)=14
2x=0          x+14=0
x1=0          x=-14

(X-3)^2=0
x^2-6x+9=0
D=(-6)^2-4*1*9=0
x==3

(x-y)(x^2+xy+y^2)-(x+y)(x^2-xy+y^2)=x^3+x^2y+xy^2-x^2y-xy^2-y^3-x^3+x^2y-xy^2-x^2y+xy^2-y^3=-2y^3

остальное извини, у меня уже голова не варит :с