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  • Need solution for RD Sharma maths class 12 chapter 25 Scalar triple product exercise multiple choice question 11

Need solution for RD Sharma maths class 12 chapter 25 Scalar triple product exercise multiple choice question 11

Answers (1)

Answer:

 10

Hint:

 If vectors are coplanar then

\left [ \overrightarrow{a} \quad \overrightarrow{b} \quad \overrightarrow{c} \right ]=0

Given:

\begin{aligned} &\begin{vmatrix} 4 &11 &m \\ 7 &2 &6 \\ 1 &5 &4 \end{vmatrix}=0 \end{aligned}

\begin{aligned} &\therefore \end{aligned} Solving,

\begin{aligned} &4(8-30)-11(28-6)+m(35-2)\\ &=-88-242+33m\\ &=-330+33m\\ \end{aligned}

Now,

\begin{aligned} &=-330+33m\\ &33m=330\\ &m=\frac{330}{33}\\ &m=10 \end{aligned}

Posted by

Gurleen Kaur

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