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Provide solution for RD Sharma maths class 12 chapter Determinants exercise 5.1 question 10 subquestion (iv)

Answers (1)

Answer:

x=2

Hint:

Take determinant of matrix on both side and equate it.

Given:

\begin{aligned} &\left|\begin{array}{cc} 3 x & 7 \\ 2 & 4 \end{array}\right|=10 \\ \end{aligned}

Solution:

\begin{aligned} &\left|\begin{array}{cc} 3 x & 7 \\ 2 & 4 \end{array}\right|=10 \\ &12 \mathrm{x}-14=10 \\ &12 \mathrm{x}=24 \\ &\mathrm{x}=2 \end{aligned}

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Gurleen Kaur

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