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JEE Mains · Maths · STD 12 - 3 and 4 . metrices and determinant

माना \(a -2 b + c =1\) है। यदि \(f(x)=\left|\begin{array}{lll}x+a & x+2 & x+1 \\x+b & x+3 & x+2 \\x+c & x+4 & x+3\end{array}\right|\) है, तो 

  1. A \(f(-50)=501\)
  2. B \(f(-50)=-1\)
  3. C \(f(50)=1\)
  4. D \(f(50)=501\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(f(50)=1\)

Step-by-step Solution

Detailed explanation

\(\mathrm{R}_{1} \rightarrow \mathrm{R}_{1}+\mathrm{R}_{3}-2 \mathrm{R}_{2}\) \(f(x)=\left|\begin{array}{ccc}{a+c-2 b} & {0} & {0} \\ {x+b} & {x+3} & {x+2} \\ {x+c} & {x+4} & {x+3}\end{array}\right|\) \(=(a+c-2 b)\left((x+3)^{2}-(x+2)(x+4)\right)\) \(=x^{2}+6 x+9-x^{2}-6 x-8=1\)…
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