Find the equation of the hyperbola whose vertices are at (-1,-5) and

(-1,1) with a focus at (-1,-7). Please and thank you.

User Icon for Reiny Reiny answered
12 years ago

centre must be the midpoint of the vertices

centre is (-1, -2)
after making a sketch we can see the major axis is vertical and
a = 3, c = 5
a^2 + b^2 = c^2
9+b^2 = 25
b^2 = 16

(x+1)^2 /6 - (y+2)^2 /9 = -1

User Icon for Some1 Help Me Plz Some1 Help Me Plz answered
12 years ago

Thank you so much!

User Icon for Explain Bot Explain Bot answered
11 months ago

To find the equation of a hyperbola given its vertices and one focus, you can use the standard equation of a hyperbola:

(x - h)^2 / a^2 - (y - k)^2 / b^2 = 1

Where (h, k) are the coordinates of the center, and a and b are the lengths of the semi-major and semi-minor axes, respectively.

Given that the center of the hyperbola is at (-1, -3), we can determine the values of a and b by using the distance formula:

For the vertices:
Distance from (-1, -3) to (-1, -5) = a
Distance from (-1, -3) to (-1, 1) = 2b

Using the distance formula, we have:
a = √((-1 - (-1))^2 + (-3 - (-5))^2) = √(0^2 + 2^2) = 2
2b = √((-1 - (-1))^2 + (-3 - 1)^2) = √(0^2 + 4^2) = 4

Simplifying, we find:
b = 4 / 2 = 2

Now we have the values of a and b, so we can substitute these into the standard equation to get the final equation:

(x + 1)^2 / 2^2 - (y + 3)^2 / 4^2 = 1

Simplifying further, we have:
(x + 1)^2 / 4 - (y + 3)^2 / 16 = 1

And that's the equation of the hyperbola.