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Question

Simplify 3a2(5a23a24) and also find its value for

(i) a = 1 (ii) a = 2.

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Solution

3a2(5a23a24)=15a49a372a2

(i) a=1

15(1)49(1)372(1)2

=15(1)9(1)72(1)

=66


(ii) a=2

15(2)49(2)372(2)2

=15(16)9(8)72(4)

=24072288

=120

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