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Question

lf det ⎡⎢⎣xx+yx+y+z2x3x+2y4x+3y+2z3x6x+3y10x+6y+3z⎤⎥⎦=64 then x=

A
0
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B
64
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C
4
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D
8
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Solution

The correct option is C 4
Given, ∣ ∣xx+yx+y+z2x3x+2y4x+3y+2z3x6x+3y10x+6y+3z∣ ∣=64
R2R22R1,R3R33R1
∣ ∣xx+yx+y+z0x2x+y03x7x+3y∣ ∣=64
x3=64
x=4

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