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butalik [34]
3 years ago
6

Find the Center and the radius of the circle x2 + y2 - 6x + 8y- 7 = 0.

Mathematics
1 answer:
777dan777 [17]3 years ago
8 0

Answer:

C(3,-4), r=4*sqrt(2)

Step-by-step explanation:

C(p, q)

x^2+y^2+dx+ey+f=0

p=-d/2, q=-e/2, r^2=p^2+q^2-f

x^2+y^2 - 6x+8y-7=0

p=-(-6)/2=6/2=3

q=-8/2=-4

r^2=3^2 +(-4)^2+7

r^2=9+16+7

r^2=32

r=sqrt(32)

r=sqrt(16*2)

r=4*sqrt(2)

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-3x - y = 0 and -8x +5y=7
andrezito [222]

Answer:

-23x = 7

Step-by-step explanation:

-3x - y =0

×5. ×5 ×5

-15x -5y = 0

-8x +5y = 7

-15x -5y -0

-23x = 7

8 0
3 years ago
Did Cherise use algebra tiles to correctly represent the product of (x – 2)(x – 3)? No, she did not multiply the x-tiles by the
Alina [70]
(x -2)(x - 3)
x(x - 3) - 2(x - 3)
x^2 - 3x - 2x + 6
x^2 - 5x + 6 <===

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6 0
3 years ago
Read 2 more answers
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Licemer1 [7]
For the first expression we will only simplify the constants:

4b - 24 + 19 ——> 4b - 5

The second expression only has variables so we simplify the whole expression

4p - 5p - 30p = -31p


The third expression we will only simplify the variables

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4 0
2 years ago
If you were to roll two number cubes and record the sum 180 times, you should expect to roll a four 10 times.
Delvig [45]

Answer:

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Step-by-step explanation:

4 0
3 years ago
2( x + 7) - (-18 + 4/5)
dem82 [27]

Answer:

2x+ \frac{156}{5}

Step-by-step explanation

simplify step-by-step.

2(x+7)−(−18+

4

5

)

Distribute the Negative Sign:

=2(x+7)+−1(−18+

4

5

)

=2(x+7)+(−1)(−18)+−1(

4

5

)

=2(x+7)+18+

−4

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Distribute:

=(2)(x)+(2)(7)+18+

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5

=2x+14+18+

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5

Combine Like Terms:

=2x+14+18+

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=(2x)+(14+18+

−4

5

)

=2x+ \frac{156}{5}

4 0
3 years ago
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