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Question

13(−2p+6q−9r)−16(−4p−18q+24r)=

A
43p
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B
5q
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C
-7r
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D
5q-7r
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Solution

The correct option is D 5q-7r
13(2p+6q9r)16(4p18q+24r)=13(2p+6q9r)13(2p9q+12r)
=13[(2p+6q9r)(2p9q+12r)]
=13(2p+6q9r+2p+9q12r)
=13(15q21r)
=(5q7r)

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