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GarryVolchara [31]
3 years ago
8

If the table coordinates for triangle XYZ and it's images using two transformations use 1 grid on both axes to represent 1 unit

for the interval from -3 to 9

Mathematics
1 answer:
Svetlanka [38]3 years ago
7 0

Answer:

I'm not good at math

Step-by-step explanation:

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Jason has 48 muffins, which he needs to box up into dozens. How many boxes does he need?
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Find the points at which the graph of 2x^2+2y^2- 20x +12y +3 = 0 has a vertical and horizontal tangent
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Compute the derivative d<em>y</em>/d<em>x</em> and check where it is zero (for horizontal tangents) or undefined (for vertical tangents).

2<em>x</em>² + 2<em>y</em>² - 20<em>x</em> + 12<em>y</em> + 3 = 0

d/d<em>x</em> [2<em>x</em>² + 2<em>y</em>² - 20<em>x</em> + 12<em>y</em> + 3] = 0

4<em>x</em> + 4<em>y</em> d<em>y</em>/d<em>x</em> - 20 + 12 d<em>y</em>/d<em>x</em> = 0

(4<em>y</em> + 12) d<em>y</em>/d<em>x</em> = 20 - 4<em>x</em>

(<em>y</em> + 3) d<em>y</em>/d<em>x</em> = 5 - <em>x</em>

d<em>y</em>/d<em>x</em> = (5 - <em>x</em>) / (<em>y</em> + 3)

• Horizontal tangents:

d<em>y</em>/d<em>x</em> = 0   →   5 - <em>x</em> = 0   →   <em>x</em> = 5

Solve for <em>y</em> when <em>x</em> = 5 :

2•5² + 2<em>y</em>² - 20•5 + 12<em>y</em> + 3 = 0

2<em>y</em>² + 12<em>y</em> - 47 = 0

<em>y</em> = (-6 ± √(130))/2

So there are two horizontal tangents at the points

(5, (-6 - √(130))/2) and (5, (-6 + √(130))/2)

• Vertical tangents:

1/(d<em>y</em>/d<em>x</em>) = 0   →   <em>y</em> + 3 = 0   →   <em>y</em> = -3

Solve for <em>x</em> when <em>y</em> = -3 :

2<em>x</em>² + 2•(-3)² - 20<em>x</em> + 12•(-3) + 3 = 0

2<em>x</em>² - 20<em>x</em> - 15 = 0

<em>x</em> = (10 ± √(130))/2

So there are two vertical tangents at the points

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Alternatively, you can complete the square to identify the equation of a circle:

2<em>x</em>² + 2<em>y</em>² - 20<em>x</em> + 12<em>y</em> + 3 = 0

2 (<em>x</em>² - 10<em>x</em>) + 2 (<em>y</em>² + 6<em>y</em>) = -3

2 (<em>x</em>² - 10<em>x</em> + 25 - 25) + 2 (<em>y</em>² + 6<em>y</em> + 9 - 9) = -3

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2 (<em>x</em> - 5)² + 2 (<em>y</em> + 3)² = 65

(<em>x</em> - 5)² + (<em>y</em> + 3)² = 65/2

which is a circle centered at (5, -3) with radius √(65/2). The horizontal tangents occur at the points where the <em>x</em> term vanishes (<em>x</em> = 5), and the vertical ones where <em>y</em> vanishes (<em>y</em> = -3).

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