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

Answers (1)

Answer:

x=\frac{13}{15}

Hint:

If matrix is singular, then |A| = 0

Given:

\begin{bmatrix} 1+x &7 \\ 3-x &8 \end{bmatrix}

Solution:

\begin{aligned} &|\mathrm{A}|=0 \\ &8+8 \mathrm{x}-21+7 \mathrm{x}=0 \\ &15 \mathrm{x}-13=0 \\ &15 \mathrm{x}=13 \\ &\mathrm{x}=\frac{13}{15} \end{aligned}

Posted by

Gurleen Kaur

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