M.E please answer...
Using the properties of determinants ,evalute
12 22 32
22 32 42
32 42 52
(ans is -8)
Expanding along R1, we get
Δ = 1 [(– 7) × (– 56) – (– 20) × (– 20)] – 0 + 0
∴ Δ = 392 – 400
⇒ Δ = – 8
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