1) 4x-(x-3y)²=? 2) (3a+p) (3a-p)+p²=? 3) (x-3y)²+(x-3y) (3y+x)=? 4) (a+2) (a-2)-(b-2)...

Question

1) 4x-(x-3y)²=?
2) (3a+p) (3a-p)+p²=?
3) (x-3y)²+(x-3y) (3y+x)=?
4) (a+2) (a-2)-(b-2) (2+b)=?

Answer 1

1)4x-x2-6xy+9y2
2)9a2-p2+p2=9a2
3)x2-6xy+x2-9y2=2x2-6xy-9y2
4)(a2-4)-(b2-4)=a2-4-b2+4=a2-b2