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Question

The determinant ∣∣ ∣∣y2−xyx2abca′b′c′∣∣ ∣∣ is equivalent to

A
bx+aycx+bybx+aycx+by
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B
axbybx+cyax+bybx+cy
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C
bx+cyax+bybx+cyax+by
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D
ax+bybx+cyax+bybx+cy
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Solution

The correct option is C ax+bybx+cyax+bybx+cy
∣ ∣y2xyx2abcabc∣ ∣=y2(bcbc)+xy(abab)+x2(acac)=y2bcy2bc+xyabxyab+x2acx2ac=(ax+by)(bx+cy)(ax+by)(bx+cy)=ax+bybx+cyax+bybx+cy

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