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Question

Simplify: 45(a4−3a3−28a2)9a(a+4)

A
a(a7)
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B
(a)
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C
(a+4)
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D
a(a+4)
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Solution

The correct option is A a(a7)
45(a43a328a2)9a(a+4)=5a2(a23a28)a(a+4)

=a[a2+4a7a28](a+4)=a(a+4)7(a+4)(a+4)

=a(a+4)(a7)(a+4)=a(a7)

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