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makkiz [27]
3 years ago
7

Use completing the square to solve (x + 7)(x – 9) = 25 for x.

Mathematics
2 answers:
lakkis [162]3 years ago
8 0

Answer:

I am pretty sure it is C

Step-by-step explanation:

photomath

Finger [1]3 years ago
3 0
We need to solve for x by completing the square of the given mathematical expression (x+7)(x-9) = 25.
First, we need to perform multiplication of (x+7) and (x-9) such as the expression become:
(x+7) (x-9) = 25
x² -9x +7x -63 = 25
x² - 2x = 25 + 63
Then perform addition of constant values 25 and 63
x² - 2x =88
Add +1 in both sides to complete the expression such as:
x² - 2x +1 = 88 +1
(x-1)(x-1) = 89
(x-1)² = 89
We see that (x-1) is a perfect square, we can now solve for the value of x such as:
(x-1) = +-√89
x1 = +√89  + 1
x1 = 10.4
x2 = -√89 +1
x2 = -8.4

The answers are 10.4 and -8.4.
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What is the solution to a system of linear equations if the answer is -3=-3?
Vsevolod [243]

Answer:

No solution

Step-by-step explanation:

So the equation is saying that -3 is equal to 3. But that is false so it would make the system of linear equations be no solution. Which means that you are giving a number that is equal to another number when its not. For example, lets say that you are given 4=-20 well that would be no solution because those aren't equal. Now lets say you are given 20=20 that would be infinitely many solutions because the two numbers are equal to each other.

Hope this helps

3 0
3 years ago
What is the slope of the equation y – 3 = –4(x – 5)?
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3 years ago
Aldo put $400 into a savings account that paid an interest rate of 5.4% per year. What was the total amount in his account at th
Greeley [361]
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3 0
4 years ago
F(t)= 102,000/1+4400e^-t
AnnZ [28]

Answer:

Beginning (t=0) population with flu is 23.

After 4 weeks, population with flu is 1250.

After an infinite amount of weeks, the population witf flu is 102000

Step-by-step explanation:

First question asks you to replace t with 0 because it says beginning.

102000/(1+4400e^-0)=102000/(1+4400)=102000/4401=23.17655 approximately. To nearest whole number this is 23.

After 4 weeks means we replace t with 4:

102000/(1+4400e^-4)

Calculator time:

1250.17142 which to nearest whole number is 1250

If t is super large, then e^-t is super close to 0.

So the limiting number is

102000/(1+4400×0)=102000/1=102000

8 0
3 years ago
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fredd [130]

Answer:

All in all, Jonathan's piggy bank contains 100 coins. Among these coins, only 50 are one-dollar coins. Therefore, the theoretical probability of picking one-dollar coin from the piggy bank is equal to 50/100 or 1/2.  

Similarly, from the experiment, 20 coins were picked and among these there are 12 one-dollar coins. The answer to the second question is therefore 12/20 or 3/5.

Step-by-step explanation:

4 0
3 years ago
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