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Question

If A=[xy],B=[ahhb],C=[xy], then ABC=

A
(ax+hy+bxy)
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B
(ax2+2hxy+by2)
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C
(ax22hxy+by2)
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D
(bx22hxy+ay2)
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Solution

The correct option is B (ax2+2hxy+by2)
Given: A=[xy],B=[ahhb],C=[xy]
ABC=[xy][ahhb][xy]
=[ax+hyxh+by][xy]=ax2+hxy+xyh+by2
=ax2+2hxy+by2

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