Given a = 2i+j – 2k b= -1 – 7j+k Find a x b

Mathematics

1 answer:

castortr0y [4]3 years ago

7 0

Step-by-step explanation:

a = 2i + j - k

b = -1 -7j + k

a × b = (2i + j - k) (-1 + 7j + k)

-2i + 14ij + 2ik - j + 7j^2 + jk + k -7jk - k^2

-2i + 14ij + 2ik -j +7j^2 +jk - 7jk + k - k^2

-2i + 14ij + 2ik - j +7j^2 - 6jk + k - k^2

You might be interested in

Plz help ASAP I’ll give lots of points

Ainat [17]

Answer:

Step-by-step explanation:

Because it is equal to the 4 side

6 0

3 years ago

What does this sign mean?

nikdorinn [45]

If stock prices are falling that’s a good time to buy

6 0

3 years ago

In a game the player wins if he rolls a 6 on a number cube .if the number cube is rolled 18 times then what is the reasonable

sp2606 [1]

<h2>Answer:</h2>

Prediction for the number of unsuccessful rolls is 15.

<h2>Step-by-step explanation:</h2>

There is $\frac{1}{6}$ chance of rolling number 6 on the cube. If we want to find out what is the prediction for rolling number 6 in 18 rolls, we need to multiply $6*\frac{1}{6}$ which is 3. So if we roll a cube 18 times, we will probably got number 6 three times. When we subtract 3 from 18 (18-3), we get 15. That is the answer to your question.