Question

Bai 1; Viet thanh tong hoac hieu cua 2 binh phuong

1, (x+y+4). (x+y-4)

2, (x-y+6). (x+y-6)

3, (x+2y+3z). (2y+3z-x)

Giup minh voi nha, thank you!^^

Answer 1

1, (x+y+4). (x+y-4)=(x+y)²-4²=(x+y)²-16

2, (x-y+6). (x+y-6)=(x+y)²-6²=(x+y)²-36

3, (x+2y+3z). (2y+3z-x)=(2y+3z)²-x²

Answer 2

\(1.\left[\left(x+y\right)-4\right]\left[\left(x+y\right)+4\right]=\left(x+y\right)^2-4^2\)