Can someone help me with this take home test?
Some questions are
Find the equation in standard form of the parabola with directrix x=5 and focus (11,-7)?
Graph: X^2/36 + y^2/16 = 1
I have been trying to figure this out and I cant I have lots more questions if anyone is interested in helping me out.
2006-06-06 14:55:38 · 6 answers · asked by vbbryan1 1 in Science & Mathematics ➔ Mathematics
I just didnt think that homeworkhelp.com would help because it says 3rd through 12th grade, this is in my college algebra class
2006-06-06 15:01:25 · update #1
I atill dont understand where the 12 in place of 4c comes from
2006-06-06 17:02:54 · update #2
nevermind c = half the distance from the directrix to the focus which the full distance is 6 and that would mae c=3 and 4(3)=12 is that correct???
2006-06-06 17:06:24 · update #3
Yes!!!!!!!!! Email me, and I'll try to shed more light on this. Parabolas are where my genius comes out :)
2006-06-06 15:00:06 · answer #1 · answered by gudrun077 4 · 1⤊ 0⤋
The directrix is x=5 and the focus is (11, -7)
The vertex, by definition, is equidistant from the directrix and the focus. Since x = 5 and x = 11 the midpoint would be at x = 8. So the vertex is at (8, -7)
If you graph those points you will see the parabola must be on it's side, open to the right.
(y + 7)^2 = 12(x - 8) would be the standard form equation.
Your second question is not a parabola, but rather an ellipse centered at the origin.
Since 36 is under the x term, the major axis runs parallel to the x axis, and is 12 units long.
36 = a^2
a = 6
the major axis is 2a long.
Similarly, the minor axis runs parallel to the y-axis and is 8 units long.
If you want to find the location of the foci:
root(36-16)
root (20)
+/-2 root 5
so the foci are located at about (-4.47, 0) and (4.47, 0)
2006-06-06 16:49:33 · answer #2 · answered by Greyhound_Guy 2 · 0⤊ 0⤋
ok so yeah that is relatively hassle-free. First multiply the 'x' mutually to get x^2.. Then multiply the a million and the x from the different set of brackets to get 1x or it seems that x... Then multiply the 5 and the x from the different set of brackets to get 5x. ultimately multiiply the a million and the 5 mutually to get 5... Then upload each little thing up. x^2+6x+5 purely remember that x + 5x equals 6x.. Above is your very final answer
2016-09-28 04:05:02 · answer #3 · answered by ? 4 · 0⤊ 0⤋
Sorry, I can't even pronounce parabola!
2006-06-08 19:01:10 · answer #4 · answered by AK 6 · 0⤊ 0⤋
try going to http://dli.taft.cc.ca.us/mathvideo/Trig/. it can help you from algebra II to pre-calculus.
2006-06-06 15:18:12 · answer #5 · answered by Anonymous · 0⤊ 0⤋
why not try hotmath.com or homeworkhelp.com
2006-06-06 14:58:52 · answer #6 · answered by wllshtt 2 · 0⤊ 0⤋