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Nina [5.8K]
3 years ago
6

Anna made an error in determining the polynomial equation of smallest degree whose roots are -4,-2, -

Mathematics
1 answer:
nalin [4]3 years ago
8 0

Answer:

See explanation

Step-by-step explanation:

Ana started the work nicely by multiplying out factors to get:\

(x+4)(x+2)(2x+1)(x-2)=0

She multiplied (x+2)(x-2) correctly using difference of two squares to get: x^2-4

Unfortunately: She made a mistake in multiplying (x+4)(2x+1) she mistakenly got x^2+9x+4 instead of 2x^2+9x+4. <em>She left out the coefficient of 2.</em>

Therefore the second step should have been:

(x^2-4)(2x^2+9x+4)

The next step will now be:

2x^4+9x^3+4x^2-8x^4-36x-16=0

This simplifies to

2x^4+9x^3-x^4-36x-16=0

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Jessica completed 21 math problems in 14 minutes. At this rate, how many math problems could she complete in 30 minutes?
harina [27]
To do this problem, you need to find how many questions per minute she can do. You would need to do 21 divided by 14. Which equals 1.5 questions per minute. From there you would do 1.5 times 30 and get 45.

So she can get 45 questions in 30 minutes.


Hope that helps!!
6 0
3 years ago
Which expression is a difference of cubes?
GREYUIT [131]

Answer:

64c15 - 0.027.

Step-by-step explanation:

That would be 64c15 - 0.027

= 4c^5 - 0.3.

3 0
3 years ago
Insert brackets to make this calculation right 4x2+5-3=
pentagon [3]
Salutations!

Insert brackets to make this calculation right 4x2+5-3

The brackets should be inserted outside 2+5. If you add brackets outside teh rest of the numbers the calculation would not make sense.

4 × (2 + 5) - 3

Hope I helped (:

have a great day!
8 0
3 years ago
What is u decreased by 17
blagie [28]
U decreased by 17 is u-17.
if you decrease a number from something, you use subtraction.

therefore, u decreased by 17 is u-17
4 0
3 years ago
At what time since leaving their flowers do Bee 1 and Bee 2 have the same distance remaining?
GrogVix [38]

By reading the given graph with the two linear functions, we want to see at which time do the two bees have the same distance remaining. We will see that the correct option is B, 6 minutes.

So, in the graph, we have distance remaining on the vertical axis and time on the horizontal axis.

We also have two lines, each one describing the distance of each bee as a function of time.

We want to see at which time do the two bees have the same distance remaining, thus, we need to see when the lines intersect (this means that for the same time, the two bees have the same distance remaining).

In the graph, we can see that the intersection happens at the time of 6 minutes, thus the correct option is B; 6 minutes.

If you want to learn more about linear function's graphs, you can read:

brainly.com/question/4025726

6 0
3 years ago
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