=m(a-2)(m? - 1)
=m(a-2)(m+ 1)(m- 1)
8a? b? -4a? b+2ab
=-2ab(4ab+2a- 1)
25(m+n)? -4(m-n)?
=[5(m+n)+2(m-n)][5(m+n)-2(m-n)]
=(7m-3n)(3m+7n)
16-24(x-y)+9(x-y)?
=[3(x-y)-4]?
=(3x-3y-4)?
(x- 1)(x-3)+ 1
=x? -4x+3+ 1
=x? -4x+4
=(x-2)?