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astraxan [27]
3 years ago
15

What is the center of the equation X^2+y^2-4x-8y-16=0

Mathematics
1 answer:
Mice21 [21]3 years ago
6 0
                                            x² + y² - 4x - 8y - 16 = 0
                                                                      + 16 + 16
                                                   x² + y² - 4x - 8y = 16
                                                   x² - 4x + y² - 8y = 16
                                  (x² - 4x + 4) + (y² - 8y + 16) = 16 + 4 + 16
                   (x² - 2x - 2x + 4) + (y² - 4y - 4y + 16) = 20 + 16
[x(x) - x(2) - 2(x) - 2(-2)] + [y(y) - y(4) - 4(y) - 4(4)] = 36
                 [x(x - 2) - 2(x - 2)] + [y(y - 4) - 4(y - 4)] = 36
                                   (x - 2)(x - 2) + (y - 4)(y - 4) = 36
                                                  (x - 2)² + (y - 4)² = 36
                                                    36           36        36
                                          ¹/₃₆(x - 2)² + ¹/₃₆(y - 4)² = 1
Center: (2, 4)
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Answer:

x^2 | y^25 |√187x

Step-by-step explanation:

First you simplify the equation then you factor 184 into its prime factors which is   184 = 23 • 23  

To simplify a square root, we extract factors which are squares, i.e., factors that are raised to an even exponent. Factors which will be extracted are: 4 = 22 Factors which will remain inside the root are: 46 = 2 • 23 To complete this part of the simplification we take the square root of the factors which are to be extracted. We do this by dividing their exponents by 2: 2 = 2 At the end of this step the partly simplified SQRT looks like this: 2 • sqrt (46x5y50)  Rules for simplifing variables which may be raised to a power: (1) variables with no exponent stay inside the radical (2) variables raised to power 1 or (-1) stay inside the radical (3) variables raised to an even exponent: Half the exponent taken out, nothing remains inside the radical. examples: (3.1) sqrt(x8)=x4 (3.2) sqrt(x-6)=x-3 (4) variables raised to an odd exponent which is  >2  or  <(-2) , examples: (4.1) sqrt(x5)=x2•sqrt(x) (4.2) sqrt(x-7)=x-3•sqrt(x-1) Applying these rules to our case we find out that SQRT(x5y50) = x2y25 • SQRT(x) sqrt (184x5y50) = 2 x2y25 • sqrt(46x)  

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Harrison has $9.30 in his coin collection all in pennies and dimes the number of dimes is three times the number of pennies how
Vsevolod [243]

Answer:

Number of Pennies = 30

Number of Dimes = 90

Step-by-step explanation:

Let the number of pennies be p and number of dimes be d

We can write 2 equations and use substitution method to solve.

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We can write:

0.01p + 0.1d = 9.30

Note: value of penny is 0.01 and dime is 0.1, in dollars

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We can write:

d = 3p

Now putting 2nd equation in first and solving for p:

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p = 9.30 /0.31

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Now we know d = 3p, so d = 3 (30) = 90

Hence

Number of Pennies = 30

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