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Find the value of x from the given determinant equation.

Mathematics

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Answer

د xx د قیمت موندلو لپاره، موږ باید د میتریکس ټاکونکی (determinant) محاسبه کړو او صفر ته یې مساوي کړو.

Step-by-step solution

2 steps
  1. د ټاکونکي معادله ولیکئ.

    د ورکړل شوي میتریکس ټاکونکی په لاندې ډول دی:

    ∣3492x2−12x−47x−73x+6∣=0\begin{vmatrix} 3 & 4 & 9 \\ 2 & x^2-1 & 2x-4 \\ 7 & x-7 & 3x+6 \end{vmatrix} = 0
  2. ټاکونکی پراخ کړئ.

    موږ د لومړي قطار په اوږدو کې د کوفاکتور پراختیا (cofactor expansion) کاروو:

    3∣x2−12x−4x−73x+6∣−4∣22x−473x+6∣+9∣2x2−17x−7∣=03 \begin{vmatrix} x^2-1 & 2x-4 \\ x-7 & 3x+6 \end{vmatrix} - 4 \begin{vmatrix} 2 & 2x-4 \\ 7 & 3x+6 \end{vmatrix} + 9 \begin{vmatrix} 2 & x^2-1 \\ 7 & x-7 \end{vmatrix} = 0

    اوس هر یو 2x2 ټاکونکی محاسبه کوو:

    • $3[(x^2-1)(3x+6) - (2x-
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