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Dafna1 [17]
3 years ago
8

What number must you add to complete the square x^2+2x=9

Mathematics
2 answers:
MAVERICK [17]3 years ago
5 0

Answer:

+ 1

Step-by-step explanation:

Given

x² + 2x = 9

To complete the square

add ( half the coefficient of the x- term )² to both sides

x² + 2(1)x + 1² = 9 + 1²

(x + 1)² = 10

yaroslaw [1]3 years ago
3 0

Answer:x =(-2-√-32)/-2=1+2i√ 2 = 1.0000-2.8284i

x =(-2+√-32)/-2=1-2i√ 2 = 1.0000+2.8284

Step-by-step explanation:

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Jackson will buy the items listed below. He has $422.76 in his checking account. He had a stored-valued card worth $75. He withd
Inessa05 [86]

Answer:

A

Step-by-step explanation:

44.99+299.49 = $344.38

$344.38 - store card ($75) = $269.48

422.76 - 269.48 - 2.5 = $150.78

Therefore answer is A

6 0
3 years ago
What is the area of the following shape? Do not put units.
____ [38]

Answer:

Area = 30

Step-by-step explanation:

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8 + 4 = 12

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4 0
3 years ago
You have some money in your wallet. You don't know the exact amount, but you think you have 60 dollars give or take 15 dollars.
Karolina [17]

Answer:

The least amount is 75 dollars.

The biggest amount is 125 dollars

Step-by-step explanation:

The absolute value function will help us determine a  range of possible values since we do not know the exact amount of money.

Defining the function.

Let x be the exact amount of money in my pocket, we can define the equation

And we know that the difference between the exact amount of money with 100 dollars must be either 25 dollars more than what we estimated, or 25 dollars less than the estimation.  So we can write:

We have a difference inside an absolute value, since we know the difference must be either +25 or -25.

Solving for x

Using the definition of absolute value we have

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Solving for x give us

If the inside of the absolute value is negative we have to use the second line of the piece-wise function definition

Solving for x give us

So the least amount of money in my pocket is 75 dollars and the biggest amount is 125 dollars.

6 0
2 years ago
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chubhunter [2.5K]

Answer:

the mean for the data set is 129.3

7 0
3 years ago
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Answer:

the answer is (2,-3)

Step-by-step,-explanation:

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