(-4x-3y)^2 要写过程,谢谢.(a+2b-c)^2(X+2y-3)(x-2y+3)

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(-4x-3y)^2 要写过程,谢谢.(a+2b-c)^2(X+2y-3)(x-2y+3)
(-4x-3y)^2 要写过程,谢谢.
(a+2b-c)^2
(X+2y-3)(x-2y+3)

(-4x-3y)^2 要写过程,谢谢.(a+2b-c)^2(X+2y-3)(x-2y+3)
(-4x-3y)²
=(4x+3y)²
=16x²+24xy+9y²
(a+2b-c)²
=(a+2b)²+2c(a+b)+c²
=a²+4b²+4ab+2ac+2bc+c²
(X+2y-3)(x-2y+3)
=[x+(2y-3)][(x-(2y-3)]
=x²-(2y-3)²
=x²-(4y²-12y+9)
=x²-4y²+12y-9