Simplify:-

1. (a^{2 _}3a + 7) × (2a + 3)

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Solution

(a^{2 _}3a + 7) × (2a + 3)=(a²x2a+a²x3-3ax2a-3ax3+7x2a+7x3)
=2a³+3a²-6a²-9a+14a+21)
=2a³-3a²+5a+21

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