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rosijanka [135]
3 years ago
13

A conic section whose focus is at the pole has the equation r=2/1+cosθ . Which of the following equations is the directrix of th

e conic?
rcosθ = -2
rcosθ = 2
rsinθ = -2
rsinθ = 2

I think its the second
Mathematics
1 answer:
julsineya [31]3 years ago
6 0

Answer:

yes its the second

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Use the definition mtan=lim
Leokris [45]

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\dfrac{f(x+h)-f(x)}h = \dfrac{(9+7(x+h)^2)-(9+7x^2)}h = \dfrac{(9+7x^2+14xh+7h^2)-9-7x^2}h = \dfrac{14xh+7h^2}h

Then as <em>h</em> approaches 0 - bearing in mind that we're specifically considering <em>h</em> <em>near</em> 0, and not <em>h</em> = 0 - we can eliminate the factor of <em>h</em> in the numerator and denominator, so that

m_{\rm tan} = \displaystyle \lim_{h\to0}\frac{f(x+h)-f(x)}h = \lim_{h\to0}\frac{14xh+7h^2}h = \lim_{h\to0}(14x+7h) = 14x

and so the slope of the line at <em>P</em> (0, 9), for which we take <em>x</em> = 0, is 0.

(b) The equation of the tangent line is then <em>y</em> = 9.

4 0
2 years ago
<img src="https://tex.z-dn.net/?f=5x%5E%7B2%7D%20%2B%20x-7%3D" id="TexFormula1" title="5x^{2} + x-7=" alt="5x^{2} + x-7=" align=
zysi [14]

Equation: 5x^2+x-7

Since there aren't any like terms and it can't be factored, your answer would be:

5x^2+x-7

Hope this answer helped you!

7 0
2 years ago
Determine value of a
S_A_V [24]

For this case we have that by definition of trigonometric relations that the sine of an angle is equal to the opposite leg to the angle on the hypotenuse. That is to say:

Sin (43) = \frac {a} {26}

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Answer:

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6 0
2 years ago
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A quadratic equation may be expressed in vertex form as:
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For C, the vertices (can be obtained by differentiating and putting equal to 0) are (0 , -4) and (0 , 4)
For D, the vertices are (4 , 0) and (0 , 4)
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7 0
2 years ago
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AnnyKZ [126]

Answer: not sure

Step-by-step explanation:

4 0
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