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= 2(2ab'2 - cd) × (2ab'2 + cd)
10. = (2a-b-(a+b)) × (2a-b+a+b)
= (2a-b-a-b) × 3a
= (a-2b) × 3a
= 3a × (a-2b)
9. = (2x+y-(x-3y)) × (2x+y+x-3y)
= (2x+y-x+3y) × (3x-2y)
= (x+4y) × (3x-2y)
maaf klok salah^^