15. 5 - (3a2 - 2a) (6 - 3a + 2a)
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ham ko lakta ha
5-(3a2-2a)(6-3a+2a)
=5-(3a2-2a)(6-5a)
=5+18a2-15a3-12a+10a2
=5-8a2-15a3-12a
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