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Explain solution RD Sharma class 12 chapter Determinants exercise 5.1 question 10 subquestion (vi) maths

Answers (1)

Answer:

x=\pm 3

Hint:

Take determinant of matrix on both side and equate it.

Given:

\begin{aligned} &\left|\begin{array}{ll} 2 x & 5 \\ 8 & x \end{array}\right|=\left|\begin{array}{ll} 6 & 5 \\ 8 & 3 \end{array}\right| \\ \end{aligned}

Solution:

\begin{aligned} &2 \mathrm{x}^{2}-40=18-40 \\ &2 \mathrm{x}^{2}=18 \\ &\mathrm{x}^{2}=9 \\ &\mathrm{x}=\pm 3 \end{aligned}

Posted by

Gurleen Kaur

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