Multiply:
(ab - 1) (3 - 2ab)
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= ab (3 - 2ab) - 1 (3 - 2ab)
= 3ab - 2a(1+1)b(1+1) - 3 + 2ab
= 3ab - 2a2b2 - 3 + 2ab
= (3ab + 2ab) - 2a2b2 - 3
= 5ab - 2a2b2 - 3
Hence, (ab - 1) (3 - 2ab) = 5ab - 2a2b2 - 3
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