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stepan [7]
3 years ago
10

In don't understand how to work this problem out

Mathematics
1 answer:
andrezito [222]3 years ago
4 0
x^2+8x-11=\\
x^2+8x+16-27=\\
(x+4)^2-27=\\
(x+4-\sqrt{27})(x+4+\sqrt27)=\\
(x+4-3\sqrt{3})(x+4+3\sqrt3)

x^2+6x-11=\\
x^2+6x+9-20=\\
(x+3)^2-20=\\
(x+3-\sqrt{20})(x+3+\sqrt{20})=\\
(x+3-2\sqrt5)(x+3+2\sqrt5)
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Susan incorrectly factored the expression below. 12a − 15b + 6 3 (4a + 5b + 3)
hichkok12 [17]

Answer:

3(4a−5b+2)

Step-by-step explanation:

The answer should have originally been 3(4a-5b+2)

3(4a+5b+3)= 12a+15b+9 which is incorrect.

6 0
2 years ago
Do you wants to buy a bike for $180 he has $40 Dave mows lawns for $10 per lawn Write in equation that can be used to find eggs
kompoz [17]

Answer:

Dave needs to mow 14 lawns to have enough money to buy a bike.

Step-by-step explanation:

180-40=140, 140/10=14. Dave needs to mow 14 lawns to have enough to buy a bike.

6 0
3 years ago
The function y = x 2 - 10x + 31 has a ____
katrin [286]

Answer:

Option B. minimum is correct for the first blank

Option C. 6 is correct for second blank.

Step-by-step explanation:

In order to find the maxima or minima of a function, we have to take the first derivative and then put it equal to zero to find the critical values.

Given function is:

f(x) = x^2-10x+31

Taking first derivative

f'(x) = 2x-10

Now the first derivative has to be put equal to zero to find the critical value

2x-10 = 0\\2x = 10\\x = \frac{10}{2} = 5

The function has only one critical value which is 5.

Taking 2nd derivative

f''(x) =2

f''(5) = 2

As the value of 2nd derivative is positive for the critical value 5, this means that the function has a minimum value at x = 5

The value can be found out by putting x=5 in the function

f(5) = (5)^2-10(5)+31\\=25-50+31\\=6

Hence,

<u>The function y = x 2 - 10x + 31 has a minimum  value of 6</u>

Hence,

Option B. minimum is correct for the first blank

Option C. 6 is correct for second blank.

8 0
3 years ago
PLEASE HURRY!
Gnoma [55]

Answer:

11

26

44

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
Here are five number cards . 2,5,7,8,9 . One of the cards is removed and the mean average of the remaining four number cards is
Elodia [21]

Answer:

7

Step-by-step explanation:

Given that there are 5 number cards.

They are 2,5,7,8,9

Total of all numbers in the cards = 2+5+7+8+9= 31

One card is removed say with number x.

Now sum new would be =31-x   ..  i

Average of remaining 4 cards = 6

So sum of remaining 4 cards = 6(4) = 24 ... ii

i and ii represent the sum of remaining 4 cards. Hence they should be equal

31-x =24

Subtract 31 from both sides to get

-x=-7

Or x =7


7 0
3 years ago
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