#matrix condition

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Matrices and Determinants 3

If A = [ array*20c 1&3 + x&2 1 - x&2&y + 1 2&5 - y&3 array ] is a symmetric matrix, then 3x + y is equal to?

We can see that after simplifying, -1 is left. The method is simple: formula → substitution → calculation → answer.

Ref: NCERT Mathematics Class XII — Matrices and Determinants

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General Mathematics 1

If | ;array*20c a&b&0 0&a&b b&0&a array | = 0 , then which one of the following is correct?

Think of it like this: using formula we get a/b is one of the cube roots of -1.. Calculation gives this directly, check steps: apply rule, substitute values, simplify to get a/b is one of the cube roots of -1..

Ref: NCERT Mathematics Class XI and XII

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#matrix condition

No questions with this tag

If A = [ array*20c 1&3 + x&2 1 - x&2&y + 1 2&5 - y&3 array ] is a symmetric matrix, then 3x + y is equal to?

If | ;array*20c a&b&0 0&a&b b&0&a array | = 0 , then which one of the following is correct?

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