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Mathematics 18 Online
OpenStudy (anonymous):

0

OpenStudy (jdoe0001):

recall that the equation of a hyperbola looks like \(\bf \cfrac{(x-h)^2}{a^2}-\cfrac{(y-k)^2}{b^2}=1\\ \cfrac{(y-k)^2}{a^2}-\cfrac{(x-h)^2}{b^2}=1\)

OpenStudy (jdoe0001):

so \(\bf 4x^2 - y^2 = 100 \implies \cfrac{4x^2}{100}-\cfrac{y^2}{100}=1 \implies \cfrac{x^2}{25}-\cfrac{y^2}{100}=1\\ \quad \\ \color{blue}{25 = 5^2\qquad \qquad 100 = 10^2}\\ \quad \\ \cfrac{x^2}{5^2}-\cfrac{y^2}{10^2}=1 \implies \cfrac{(x-0)^2}{5^2}-\cfrac{(y-0)^2}{10^2}=1 \)

OpenStudy (jdoe0001):

this hyperbola, notice the fraction with the POSITIVE sign, the "fraction with the x", thus the hyperbola opens towards the x-axis, that is, to the left and right you can get the asymptotes for a "horizontally traverse axis" hyperbola at \(\bf y = k\pm \cfrac{b}{a}(x-h)\)

OpenStudy (anonymous):

so that's 0+- 25/100(x-0)??

OpenStudy (jdoe0001):

\(\bf \bf y = k\pm \cfrac{b}{a}(x-h)\) <---- notice "a" and "b", not squared

OpenStudy (jdoe0001):

your hyperbola will be like \(\bf \cfrac{(x-h)^2}{a^2}-\cfrac{(y-k)^2}{b^2}=1\) center is at (h, k)

OpenStudy (anonymous):

isnt that just 0,0 then in what you typed in?

OpenStudy (jdoe0001):

yea

OpenStudy (anonymous):

how do i find the asymptotes ?

OpenStudy (jdoe0001):

so your asymptotes will be at \(\bf \cfrac{(x-0)^2}{5^2}-\cfrac{(y-0)^2}{10^2}=1\\ \quad \\ \quad \\ y = k\pm \cfrac{b}{a}(x-h) \implies y = 0\pm \cfrac{10}{5}(x-0)\)

OpenStudy (anonymous):

can you explain how to plug that in? if i only have h and k?

OpenStudy (jdoe0001):

\(\bf \cfrac{(x-0)^2}{\color{red}{5}^2}-\cfrac{(y-0)^2}{\color{red}{10}^2}=1 \implies \cfrac{(x-h)^2}{\color{red}{a}^2}-\cfrac{(y-k)^2}{\color{red}{b}^2}=1\\ \quad \\ \quad \\ y = k\pm \cfrac{\color{red}{b}}{\color{red}{a}}(x-h) \implies y = 0\pm \cfrac{10}{5}(x-0)\)

OpenStudy (anonymous):

asymptotes 5/10 so y= 1/2x and y= -1/2x? center (0,0)?

OpenStudy (jdoe0001):

5/10?

OpenStudy (jdoe0001):

notice, the "b" is in the numerator

OpenStudy (anonymous):

10/5* = y=2x and y=-2x?

OpenStudy (jdoe0001):

yeap

OpenStudy (anonymous):

ty

OpenStudy (jdoe0001):

yw

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