1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
valkas [14]
3 years ago
7

If a=2i-3j-k and b=i+4j+2k what us ab​

Mathematics
1 answer:
Masteriza [31]3 years ago
8 0

Answer:

2i²+5ij+3ik-12j²-10jk-2k²

Step-by-step explanation:

a=2i-3j-k

b=i+4j+2k

ab = (2i-3j-k) (i+4j+2k)

Multiply both bracket by expanding the bracket

2i(i+4j+2k)-3j(i+4j+2k)-k(i+4j+2k)

Multiply

2i²+8ij+4ik-3ij-12j²-6jk-ik-4jk-2k²

Collect like terms

2i²+8ij-3ij+4ik-ik-12j²-6jk-4jk-2k²

2i²+5ij+3ik-12j²-10jk-2k²

You might be interested in
The opposite inverse of -1/9 is
melomori [17]

Answer:

1/-9

Step-by-step explanation:

hope it helps... ✌️✌️✌️✌️

Byeeee..

7 0
3 years ago
4x + 6 - x = 7 + 2 x
rodikova [14]

Answer:

x = 1

Step-by-step explanation:

4x + 6 - x = 7 + 2x

3x + 6 = 7 + 2x

3x - 2x = 7 - 6

x = 1

8 0
3 years ago
Read 2 more answers
Write -2x^2 (-5x^2 + 4x^3) in standard form
saul85 [17]
-2x·-2x·(-5x·-5x+4x·4x·4x) Basically, you write out the number depending on the exponent. So if you have a power/exponent of 3, you write it out multiplied by itself 3 times. Hope this helps!
7 0
3 years ago
Plzzz answer question number 2 I will give you 100 points
nirvana33 [79]
Arabia because she has the largest numbers
3 0
4 years ago
Read 2 more answers
A restaurant chef bought potatoes at four different stores. The table shows the amount of the potatoes she bought at each store
hichkok12 [17]

Answer:

The way to answer this question is to find out the price per pound potato by dividing the amount the restaurant chief paid by the number of pounds bought.

Your question lacks details on the pounds bought in the other stores so I will assume these figures and you can use it as a reference.

Restaurant B - 2 pounds

Restaurant C - 12 pounds

Restaurant D - 5 pounds

Price per pound

Restaurant A = 6.60/8

= $0.83

Restaurant B = 3.50/2

= $1.75

Restaurant C = 9.75/12

= $0.82

Restaurant D = 4.80/8

= $0.96

<u><em>Restaurant C </em></u><em>has the lowest price per pound for potatoes. </em>

3 0
3 years ago
Other questions:
  • Find the value of y. <br> Please Help Needed Badly!!
    5·1 answer
  • Write the slope-intercept form of the equation for the line.
    11·1 answer
  • The first figure is dilated to form the second figure.
    15·2 answers
  • Which pair of figures has the same number of faces as vertices?
    5·2 answers
  • This composite figure is made of two identical pyramids attached at their bases. Each pyramid has a height of 2 units. 2 identic
    13·2 answers
  • Ellen is taking some friends on a picnic. They'll need to follow a path to get the picnic spot. A map of the path is based on a
    13·1 answer
  • What is the value of the expression
    12·2 answers
  • Solve the system of equations using substitution. <br> y = x + 6<br> y = –2x – 3
    12·2 answers
  • Minutes used (per month)
    7·1 answer
  • An urn contains 13 red marbles and 11 blue marbles. 12 marbles are chosen at random. What is the probability that 7 red marbles
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!