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Lelechka [254]
2 years ago
10

The sum of the roots of 8x² - 2x = 1 is: -1/4 1/4 -1/8

Mathematics
2 answers:
Nimfa-mama [501]2 years ago
6 0
8x^2 - 2x = 1
8x^2 - 2x - 1 = 0

(2 +/-√(-2)^2 - 4(8)(-1))/ 2(8)
(2 +/-√4 + 32) / 16
(2 +/-√36) / 16
(2 +/- 6) / 16

2+6/16
1/2

2-6/16
-1/4

now since they want the sum of the roots
1/2 - 1/4

sum = 1/4
madreJ [45]2 years ago
4 0
8x^2-2x-1=0

8x^2-4x+2x-1=0

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

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

x=1/2 and -1/4

So the sum is 1/2-1/4=1/4

1/4
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Complete the table so that the cost per banana remains the same.
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Step-by-step explanation:

No. of banana    Cost      Unit price

4                            2            0.50

6                            3             0.50

7                           3.5           0.50

20                         10            0.50

20                          10             0.50

33                          16.50        0.50

Cost = No of banana x unit price

Cost = 4 x 0.50 = 2

Cost = 6 x 0.50 = 3

Cost = 7 x 0.50 = 3.50

Cost = 20 x 0.50 = 10

No of banana = Cost / Unit price

No of banana = 10 / 0.50 = 20

No of banana = 16.50 / 0.50 = 33

3 0
3 years ago
The perimeter of a rectangle is 80ft.and the length is 21ft the width of the rectangle is
laila [671]

Answer: 19 ft


Step-by-step explanation: To find the width, multiply the length that you have been given by 2, and subtract the result from the perimeter. You now have the total length for the remaining 2 sides. This number divided by 2 is the width. Hope this helps :)


3 0
3 years ago
the following table gives the number of people on the titanic by class and whether or not they survived gi
ziro4ka [17]

Answer:

Where’s the rest of the question ??

Step-by-step explanation:

4 0
2 years ago
Solve for y.<br> y y<br> —— = ——<br> P-9 P+9
Veronika [31]

9514 1404 393

Answer:

  y = 0

Step-by-step explanation:

Subtracting the right side gives ...

  \dfrac{y}{P-9}-\dfrac{y}{P+9}=0\\\\y\left(\dfrac{(P+9)-(P-9)}{P^2-81}\right)=0\\\\y\left(\dfrac{18}{P^2-81}\right)=0\\\\\boxed{y=0}

The factor multiplying y cannot be zero, so y must be zero.

5 0
3 years ago
In a game of chance, two pyramid-shaped, four-sided dice (with sides 1, 2, 3, 4). one colored red and the other colored green, a
Soloha48 [4]

Answer:

0.25 or 25%

Step-by-step explanation:

There are 4 possible outcomes for each die, which gives us 16 possible combinations (4 x 4). In order for the sum to exceed 5, the possible outcomes are:

Red = 3, and Green = 3

Red = 3, and Green = 4

Red = 4, and Green = 3

Red = 4, and Green = 4

Therefore, the probability of winning on a single play is:

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The probability is 0.25 or 25%.

5 0
2 years ago
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