1. х(х-7)(х+7)
2. 2у(у-4)(у+)
3. у(0.4-у)(0.4+у)
4. 2\3(х-2\3)(х+2\3)
5. 5\11х² (х-1)(х+1)
6. 7у² (у-1\5)(у+1\5
1. (m-n)(m+n) - (m-n)=(m-n)(m+n-1)
2.(3x-2y)(3x+2y)-( 3x-2y) = (3x-2y)(3x+2y-1)
3. x²(x+3) -4(x+3)= (x+3)(x-1)(x+1)
4. (9-3+8y)(9+3-8y)=(6-8y)(12-8y)