MCQ
Find $m$ if value of determinant $\left|\begin{array}{cc}m & 2 \\ -5 & 7\end{array}\right|$ is 31.
- A14
- ✓3
- C28
- D21
✓
Answer
Correct option: B.
3
3
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Two isosceles triangles have equal angles and their areas are in the ratio $16 : 25.$ The ratio of their corresponding heights is:
→If $\cos\theta=\frac{4}{5}$ then $\tan\theta=?$
→In triangles $\text{ABC}$ and $\text{DEF}, \angle\text{A}=\angle\text{E}=40^\circ, \text{AB : ED = AC : EF}$ and $\angle\text{F}=65^\circ,$ then $\angle\text{B}=$
→If $\alpha$ and $\beta$ are the zero of $2x^2 + 5x − 8,$ then the value of $(\alpha\beta)$ is:
→If radii of two concentric circles are $4\ cm$ and $5\ cm,$ then the length of each chord of one circle which is tangent to the other circle is:
→The height of a cone is $30\ cm$. A small cone is cut off at the top by a plane parallel to the base. If its volume be of the volume of the given cone, then the height above the base at which the section has been made, is:
→Distance of point A (7, 24) from the origin is _______ .
If $\cos\text{A}+\cos^2\text{A}=1,$ then $\sin^2\text{A}+\sin^4\text{A}=$
→Find the sum of first n odd natural numbers.
In the given figure, if $\angle\text{AOD}=135^\circ$ then $\angle\text{BOC}$ is equal to:
→