If A = | l 1215 1117 | and B = | ll 2 & 7 4 & 9 | find A -2 B - Vidyadip

Question

If $A =\left|\begin{array}{l}1215 \\ 1117\end{array}\right|$ and $B =\left|\begin{array}{ll}2 & 7 \\ 4 & 9\end{array}\right|$ find $A -2 B$

✓

Answer

$\begin{array}{l}A=\left|\begin{array}{ll}12 & 15 \\ 11 & 17\end{array}\right|_{2 \times 2}, B=\left|\begin{array}{ll}2 & 7 \\ 4 & 9\end{array}\right|_{2 \times 2} \end{array} $
$ 2 B=\left|\begin{array}{lll}4 & 1 & 4 \\ 8 & 1 & 8\end{array}\right| $
$ A-2 B=\left|\begin{array}{cc}12-4 & 15-14 \\ 11-8 & 17-18\end{array}\right| $
$ =\left|\begin{array}{cc}8 & 1 \\ 3 & -1\end{array}\right|_{2 \times 2}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[2 Mark Question Answer]" from Matrices→Matrices — all question types→Mathematics STD 10 question papers→ICSE Board STD 10 question papers→ICSE Board question paper generator→

Similar questions

A ball is drawn at random from a box containing 12 white, 16 red and 20 green balls. Determine the probability that the ball drawn is : red

Asharaf went to see a movie. He wanted to purchase a movie ticket for Rs. 80. As the ticket for Rs. 80 was not available, he purchased a ticket for Rs. 120 of upper class. How much extra GST did he pay for the ticket? (GST for a ticket below Rs. 100 is 18% and GST for a ticket above Rs. 100 is 28%)

The internal and external diameters of a hollow hemi-spherical vessel are $21$ cm and $28$ cm respectively. Find volume of material of the vessel.

The volume of a conical tent is $1232 m^3$ and the area of the base floor is $154 m^2.$ Calculate the: height of the tent.

Two dice (each bearing numbers 1 to 6) are rolled together. Find the probability that the sum of the numbers on the upper-most faces of two dice is: 4 or 5

$A, B$ and $C$ have co-ordinates $(0, 3), (4, 4)$ and $(8, 0)$ respectively. Find the equation of the line through A and perpendicular to $BC.$

Given a Δ ABC with unequal sides. Find a point which is equidistant from B and C as well as from AB and AC.

A and B are friends. Ignoring the leap year, find the probability that both friends will have:
different birthdays?

Is the line x – 3y = 4 perpendicular to the line 3x – y = 7?

Solve : 1 ≥ 15 – 7x > 2x – 27, x ∈ N