2 years ago

The general form of the equation of a circle is x^2+y^2−4x−8y−5=0.

1 answer:

5 0

X² - 4x + y² - 8y = 5

Complete the square:
x² - 4x + (4) + y² - 8y + (16) = 5 + (4) + (16)
→ (x - 2)² + (y - 4)² = 25

Center: (2,4)
radius: √25 = 5

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X+ 60 + 120 + 150+ 75 = 360

garik1379 [7]

Answer:

There is no way it can equal 360 since 60+120+150+75=405? Was it a typo?

Step-by-step explanation:

7 0

3 years ago

2. The length of XZ is 28 units. If XY = 2x + 2 and YZ = 9x – 7, what are the lengths of XY and

Novosadov [1.4K]

Answer:

XY = 8 and YZ = 20

Step-by-step explanation:

If XY and YZ are on the one line, we can write

XY + YZ = 28

(2x+2) + (9x - 7) = 28

2x+2 + 9x - 7 = 28

11x - 5 = 28

11x = 33

x = 3

XY = 2x+2 = 2*3 + 2 = 8

YZ = 9x - 7 = 9*3 - 7 = 27 - 7 = 20

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2 years ago

What is the length of QR?

Elena L [17]

Answer:

Step-by-step explanation:

Since the triangle is right with hypotenuse QR

Use Pythagoras' identity to solve for QR

The square on the hypotenuse is equal to the sum of the squares on the other two sides, that is

QR² = 8² + (8 $\sqrt{3}$ )²

= 64 + 192

= 256 ( take the square root of both sides )

QR = $\sqrt{256}$ = 16

7 0

3 years ago

100 PTS PLEASE HELP I DO NOT UNDERSTAND!!!!

vodomira [7]

Hope this help!!!

Have a great day!!!

7 0

2 years ago

Read 2 more answers

Appreciate the help with answering this question . Thank you !

skad [1K]

Step-by-step explanation:

c^2 = a^2 + b^2

$\sqrt{40 ^{2} + 30 {}^{2} } = 50$

$\sqrt{60 {}^{2} - 40 {}^{2} } = 44.7$

6 0

2 years ago