Question

1.（-1+4x）（4x-1）2.(-3a+b)(-3a-b)3.(-4x-5y)(5y-4x)4.(m平方-3)(-m

Answer 1

1.（-1+4x）（4x-1）=(4x-1)^2=16x^2-8x+1

2.(-3a+b)(-3a-b)=9a^2-b^2

3.(-4x-5y)(5y-4x)=(-4x-5y)(-4x+5y)=16x^2-25y^2

4.(m平方-3)(-m平方+3)=-(m平方-3)^2=-m^2+6m-9