First slide
Introduction to Determinants
Question

If xx+yx+y+z2x3x+2y4x+3y+2z3x6x+3y10x+6y+3z=64, then the real value of x is ________ .

Moderate
Solution

Δ=x1x+yx+y+z23x+2y4x+3y+2z36x+3y10x+6y+3z=x211x+y234x+3y3610x+6yC3C3zC1,C2C2yC1=x31112343610C3C3yC2=x3(68+3)=64x3=64 or x=4

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