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Virty [35]
2 years ago
6

Using the equation x squared minus c equals 0 , what value of c has 9 and -9 as solutions.

Mathematics
1 answer:
Svetach [21]2 years ago
3 0

9514 1404 393

Answer:

  c = 81

Step-by-step explanation:

The equation x² -c = 0 can be factored as ...

  (x -√c)(x +√c) = 0

which has roots ±√c.

The roots are given as ±9, so we have ...

  ±9 = ±√c

  c = (±9)² = 81

The value c = 81 makes the equation have ±9 as solutions.

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Simplify (3x)-1. A. 81x^4. B. 4x^6. C. 1/3x. D. 1/x^6
elena55 [62]
If you mean: (3x)^-1

When you have a power to a negative number (1 in this case), place the power on the numerator, with the base in the denominator.

(3x)^-1 = 1/3x

1/3x, or C) is your answer


hope this helps
3 0
3 years ago
A restaurant offers a​ $12 dinner special that has 77 choices for an​ appetizer, 1010 choices for an​ entrée, and 44 choices for
krok68 [10]
<span>280 I'm assuming that this question is badly formatted and that the actual number of appetizers is 7, the number of entres is 10, and that there's 4 choices of desserts. So let's take each course by itself. You can choose 1 of 7 appetizers. So we have n = 7 After that, you chose an entre, so the number of possible meals to this point is n = 7 * 10 = 70 Finally, you finish off with a dessert, so the number of meals is: n = 70 * 4 = 280 Therefore the number of possible meals you can have is 280. Note: If the values of 77, 1010 and 44 aren't errors, but are actually correct, then the number of meals is n = 77 * 1010 * 44 = 3421880 But I believe that it's highly unlikely that the numbers in this problem are correct. Just imagine the amount of time it would take for someone to read a menu with over a thousand entres in it. And working in that kitchen would be an absolute nightmare.</span>
5 0
2 years ago
Which angle refers to the same angle as ∠EDC
Pepsi [2]

Answer:

Point D does

Step-by-step explanation:

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5 0
2 years ago
Can anyone tell me if these answers are right?
k0ka [10]

Answer:

Ummm. 1 & 3 look good double check 2

Step-by-step explanation:

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8 0
3 years ago
Find the value of x in this figure.
AleksAgata [21]

Step-by-step explanation:

angle x is equal to 65

angles of triangle is equal to 180

3 0
3 years ago
Read 2 more answers
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