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Question

16x+4z times (2y8x) is equal to

A
128x232xy32xz8yz
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B
128y232xy32xz8yz
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Solution

The correct option is A 128x232xy32xz8yz
Applying First Out Inside Last (FOIL) technique we get,
(16x+4z)×(2y8x)
=(16x+4z)×(2y+8x)
=(16x+4z)×(2y+8x)
=(16x×2y+16x×8x+4z×2y+4z×8x)
=32xy128x28yz32zx
=128x232xy32xz8yz

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