find this please need help with this sum
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Step-by-step explanation:
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Answer:
Step-by-step explanation:
Given,
Let A = L.H.S. = 3 4 7, 2 1 3, -5 -1 2
Determinant of A is
= [ 3 × (1×2-(-1)×3) - 4 × ( 2×2 -(-5)×3) + 7 × (2×(-1) -(-5)×1) ]
= (3×(2+3) - 4×(4+15) + 7×(-2+5)
= 3×5 - 4×19 + 7×3
= 15 - 76 + 21
= - 76 + 36
= -40 = R.H.S.
Therefore L.H.S. = R.H.S.
Hence Determinant of A = -40 is proved.
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