please solve this questions factorise the following

please solve this questions factorise the following @ (i) 5ph — 109k 4 2 rph — 4 qrk @ (i) ab (x2 + y?) — xy(a2 + P) (i) + ab(l - 24) -2B (iO — + 2b) 20b. (it) (ax + by)2 + (bx — ay)2. 3x2y — 3xy + — 12. Hint, (ii) 3 is a common factor. First take 3 outside.