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Mrac [35]
4 years ago
12

I can't solve this question

Mathematics
1 answer:
Jobisdone [24]4 years ago
5 0

Answer:

The answer is 9

Step-by-step explanation:

Given that a = √3 + √2 and b = √3 - √2 . To be more easier, we do it one by one :

First, a² :

(√3 + √2)(√3 + √2)

= 3 + √6 + √6 + 2

= 5 + 2√6

Second, ab :

(√3 + √2)(√3 - √2)

= 3 - √6 + √6 - 2

= 1

Third, b² :

(√3 - √2)(√3 - √2)

= 3 - √6 - √6 + 2

= 5 - 2√6

Then, evaluate a² - ab + b² :

5 + 2√6 - 1 + 5 - 2√6

= 9

(Hope this can help)

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Solve the system of equations -6x+5y=0 and −5x+5y=−5 by combining the equations.
Brrunno [24]

Answer:

Step-by-step explanation:

-6x+5y=0 and −5x+5y=−5

Subtract the second from the first:

-6x+5y=0

<u>5x-5y= 5</u>

-x = 5

x = -5

7 0
2 years ago
PLEASE HELP! I WOULD APPRECIATE IT SO MUCH. IF ANSWERED, PLEASE USE THE PYTHAGOREAN THEOREM!
Nata [24]

To find out how far Rachel walked round trip, we first need to find out how long the fastest way between her house and the park is. In the picture, we see a common Pythagorean Triple (the possibility for the sides of a right triangle). The triple with 3 and 4 is 3, 4, and 5. That means that the last side is 5. That means that the total distance is 3 + 4 + 5 km or 12 km. But, if you would like to solve this using the Pythagorean Theorem, one can do it as follows. Since the legs of the triangle are 3 and 4, the hypotenuse squared would be 3² + 4² = 9 + 16 = 25. To find the hypotenuse, we have to find the square root of 25 which is 5, which leads us to the same answer as before.

8 0
3 years ago
Express the following ratio in simplest form 16:40
givi [52]

Answer:

16 / 40 hope it helps you uuuuuuu

7 0
3 years ago
Read 2 more answers
What is number 31 as a sum of tens and ones?
Ainat [17]
31 would be a sum of 3 tens and 1 one.
5 0
3 years ago
Read 2 more answers
Number 4 plewse asap plzzzzzzzz its due tomorrow i dont know how to do it
Lesechka [4]
Problem 4
<em>A</em>
If he is staying in the same place km for 1/2 hour, you can assume he's eating lunch or something. He hasn't moved at all, so his speed = distance over time = 0/(0.5) hours = 0
0 = answer

<em />
<em>B
</em>Watch out for this. It's a little bit nasty. He starts out at 20 km He ends up at 0 km. It means he is going back to were he started from. If it said velocity, you'd have a problem. 
<em>
</em>The time taken is 1.5 to 3 hours = 1.5 hours
His speed is d/t
<em>His speed is 20/1.5 = 13.33 km/hr.

</em>Speed = total distance / total time
total time = 3 hours.
Total distance = 40 km which is what the odometer would show.
Speed = 40 km/3 hours = 13.33 km/hour

<em>C
</em>You could just read the graph. He is 10 km from home.


6 0
3 years ago
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