giup mik voi a (x-2)^2-(3x+5)^2

2 bình luận về “giup mik voi a (x-2)^2-(3x+5)^2”

1. (x-2)^2-(3x+5)^2

   =[(x-2)+(3x+5)].[(x-2)-(3x+5)]

   =(x-2+3x+5)(x-2-3x-5)

   =(4x+3)(-2x-7)

   =-8x^2-28x-6x-21

   =-8x^2-34x-21

   Trả lời
2. Giải đáp:

   (x-2)^{2}-(3x+5)^{2}

   =[(x-2)-(3x+5)].[(x-2)+(3x+5)]

   =(x-2-3x-5).(x-2+3x+5)

   =(-2x-7).(4x+3)

   =-8x^{2}-6x-28x-21

   =-8x^{2}-34x-21

   #DYNA

   Trả lời