32. Using Cofactors of elements of third column, evaluate
32. Using Cofactors of elements of third column, evaluate
Given,
Co-factor of elements of third column

∴ Δ = a13A13 + a23A23 + a33A33
= yz (z-y) + zx [- (z-x)] + xy (y-x)
= y z2-y2z-z2x+ zx2 + xy2-x2y.
= yz2-y2z+ (xy2-xz2) + (zx2-x2y)
= yz (z-y) + x (y2 – z2) -x2 (y-z)
= -yz (y-z) + x (y + z) (y-z) -x2 (y-z)
= (y-z) [-yz + x (y + z) -x2]
= (y-z) [-yz + xy +
Similar Questions for you
|2A| = 27
8|A| = 27
Now |A| = α2–β2 = 24
α2 = 16 + β2
α2– β2 = 16
(α–β) (α+β) = 16
->α + β = 8 and
α – β = 2
->α = 5 and β = 3
|A| = 3
|B| = 1
->|C| = |ABAT| = |A|B|A7| = |A|2|B|
= 9
->|X| = |A|C|2|AT|
= 3 * 92 * 3 = 9 * 92 = 729
|A| = 2
&nb
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Maths Ncert Solutions class 12th 2026
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