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Marizza181 [45]
3 years ago
13

The equation of a circle in general form is ​ x2+y2+18x−36y+369=0 ​

Mathematics
2 answers:
swat323 years ago
7 0
You have to complete the square of (x²+18x+?) as well as for (y²-36y+?)

You will find: (x+9)² + (y-18)² = 36


& this is the standard equation requested
Ainat [17]3 years ago
7 0

Answer:

(x+9)^2+(y-18)^2=6^2

Step-by-step explanation:

We have been given equation of a circle in general form x^2+y^2+18x-36y+369=0. We are asked to find the equation of the circle in standard form.

We know that equation of a circle in standard form is of format: (x-h)^2+(y-k)^2=r^2, where (h,k) represents the center of the circle and r represents radius.

We will convert our given equation in standard form by completing the squares as shown below:

x^2+18x+y^2-36y+369-369=0-369    

x^2+18x+y^2-36y=-369

Adding (\frac{b}{2})^2 to both sides of our equation we will get,

(\frac{18}{2})^2=(9)^2=81

(\frac{36}{2})^2=(18)^2=324

x^2+18x+81+y^2-36y+324=-369+81+324

x^2+18x+81+y^2-36y+324=36    

(x+9)^2+(y-18)^2=6^2    

Therefore, the equation of the given circle in standard form would be (x+9)^2+(y-18)^2=6^2.

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Joan needs to estimate the size of her bedroom so that she can buy enough paint to cover the walls. Two of the walls measure 2.8
labwork [276]

The total area of the room is 37.6376 and the no. of cans required to paint the wall is 3 cans.

The measurement of two of the walls is 2.86 metres and 3.16 metre

Area of the two walls = 2(length x breadth)

Area = 2(2.86 x 3.16) = 18.0752 m²

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3 0
1 year ago
Answer please !! Due in 45 minutes m
weqwewe [10]

Answer:

(-3,3)

Step-by-step explanation:

Using elimination:

Multiply the first equation by 8 and the second by 5 which equals

40x+56y=48

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Now you add them together

40x+(-40x)=0 so that crosses out

56y+(-60y)= -4y

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Subtract 21 from both sides

5x=-15

Divide by 5

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Your final solution is (-3,3)

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