Solve the given determinants
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Answer:
∆ =![\left[\begin{array}{ccc}9&9&12\\1&-3&-4\\1&9&12\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D9%26amp%3B9%26amp%3B12%5C%5C1%26amp%3B-3%26amp%3B-4%5C%5C1%26amp%3B9%26amp%3B12%5Cend%7Barray%7D%5Cright%5D "\left[\begin{array}{ccc}9&9&12\\1&-3&-4\\1&9&12\end{array}\right]")
Expanding
∆ = 9 { -3 × 12 - ( - 4 × 9 ) } - 1 { 9 × 12 - 9 × 12 } + 1 { 9 × ( -4 ) - ( - 3 × 12 ) }
∆ = 9 ( - 36 + 36 ) - 1 ( 108 - 108 ) + 1 ( - 36 + 36 )
∆ = 0
#TogetherWeGoFar.
Answer:
∆ =
Expanding
∆ = 9 { -3 × 12 - ( - 4 × 9 ) } - 1 { 9 × 12 - 9 × 12 } + 1 { 9 × ( -4 ) - ( - 3 × 12 ) }
∆ = 9 ( - 36 + 36 ) - 1 ( 108 - 108 ) + 1 ( - 36 + 36 )
∆ = 0
#TogetherWeGoFar.
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