(1) - M quartic + M & # 178; n & # 178; (2) 4 (M + n) & # 178; - 9 (m-n) & # 178; (3) (5a-b) & # 178; + 20ab with factorization factor,

(1) - M quartic + M & # 178; n & # 178; (2) 4 (M + n) & # 178; - 9 (m-n) & # 178; (3) (5a-b) & # 178; + 20ab with factorization factor,

1.m²(n²-m²)
2(2m+2n+3m-3n)(2m+2n-3m+3n)=(5m-n)(5n-m)
3.(5a+b)²