If $a x^4+b x^3+c x^2+50 x+d=\left|\begin{array}{ccc}x^3-14 x^2 & -x & 3 x+\lambda \\ 4 x+1 & 3 x & x-4 \\ -3 & 4 & 0\end{array}\right|$, then find ' $\lambda$ '.

• Correct answer
  A

  2
• B

  –2
• C

  1
• D

  –1

Hence, the correct answer is option: 'A'.