यदि तो दिखाइए कि |2A| = 4|A|
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Given :
To find : दिखाइए कि |2A| = 4|A|
Solution :
हमें पता है की
Det A = | A | = Δ = ad - bc
a = 1
b = 2
c = 4
d = 2
Det A = | A | = 1 * 2 - 2 * 4
=> | A | = 2 - 8
=> | A | = - 6
a = 2
b = 4
c = 8
d = 4
Det 2A = | 2A | = 2 * 4 - 4 * 8
| 2A | = 8 - 32
| 2A | = - 24
=> | 2A | = 4 ( - 6 )
=> | 2A | = 4 |A|
QED
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