Rút gọn

E=(4-x)(x+4)-(x+2)²

P=(2x+3)²-(2x+1)(2x-1)

Q=(4-3x)²-(9x-1)(9x+1)

M=(5+x) (x-5)-(x-3)²

N=2(3x+1)(x-2)-6(x+2)²