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Question

Show that x4 is a factor of ∣ ∣x22x33x4x42x93x16x82x273x64∣ ∣

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Solution

∣ ∣x22x33x4x42x93x16x82x273x64∣ ∣∣ ∣261241848x82x273x64∣ ∣R1R1R2R2R2R3∣ ∣2004624x8x33x16∣ ∣C2C23C1C3C36C1ExpandingalongR1=2[6(3x16)24(x3)]=2[18x96+24x+72]=2[6x24]=12(x4)
therefore x4 is a factor of given determinant.

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