SOLUTION: Find the coordinates of the center, the foci, and the vertices, and the equations and asymptotes of the graph of each equation. Then graph the equation. x^2-4y^2-4x+24y-36=0

Algebra ->  Quadratic-relations-and-conic-sections -> SOLUTION: Find the coordinates of the center, the foci, and the vertices, and the equations and asymptotes of the graph of each equation. Then graph the equation. x^2-4y^2-4x+24y-36=0      Log On


   



Question 699163: Find the coordinates of the center, the foci, and the vertices, and the equations and asymptotes of the graph of each equation. Then graph the equation.
x^2-4y^2-4x+24y-36=0

Answer by Edwin McCravy(20059) About Me  (Show Source):
You can put this solution on YOUR website!
4x²-y²-8x+20 = 0         |        x²-4y²-4x+24y-36 = 0

Rearrange the terms in this order x²,x,y²,y, and constants
on the right:

   4x²-8x-y² = -20                      x²-4x-4y²+24y = 36 

 4(x²-2x)-y² = -20                   (x²-4x)-4(y²-6y) = 36

Complete the square in the parentheses. In the equation on
the left since there is no y-term write y as (y-0)

4(x²-2x+1)-(y-0)² = -20+4         (x²-4x+4)-4(y²-6y+9) = 36+4=36

    4(x-1)²-(y-0)² = -16                (x-2)²-4(y-3)² = 4

Get 1 on the right by dividing through by the constant term:

   %284%28x-1%29%5E2%29%2F%28-16%29%22%22-%22%22%28%28y-0%29%5E2%29%2F%28-16%29%22%22=%22%22%28-16%29%2F%28-16%29            %28%28x-2%29%5E2%29%2F4%22%22-%22%224%28y-3%29%5E2%2F4%22%22=%22%224%2F4         

   -%284%28x-1%29%5E2%29%2F16%22%22%2B%22%22%28%28y-0%29%5E2%29%2F16%22%22=%22%221            %28%28x-2%29%5E2%29%2F4%22%22-%22%224%28y-3%29%5E2%2F4%22%22=%22%221

   -%28x-1%29%5E2%2F4%22%22%2B%22%22%28y-0%29%5E2%2F16%22%22=%22%221            %28%28x-2%29%5E2%29%2F4%22%22-%22%22%28y-3%29%5E2%2F1%22%22=%22%221

Switch the terms on the left so that the positive term comes first:

   %28y-0%29%5E2%2F16%22%22-%22%22%28x-1%29%5E2%2F4%22%22=%22%221            %28%28x-2%29%5E2%29%2F4%22%22-%22%22%28y-3%29%5E2%2F1%22%22=%22%221

The equation on the left has its y-term first and therefore represents a
hyperbola that looks like this  whereas the equation on the right 
has its x-term first and therefore it represents a hyperbola that looks
like this )(

   %28y-k%29%5E2%2Fa%5E2%22%22-%22%22%28x-h%29%5E2%2Fb%5E2%22%22=%22%221            %28%28x-h%29%5E2%29%2Fa%5E2%22%22-%22%22%28y-k%29%5E2%2Fb%5E2%22%22=%22%221

  

For the hyperbola on the left:

center=(h,k)=(1,0)
vertices=(h,k±a)=(1,4)&(1,-4)
focus=(h,k±c)
c²=a²+b²
c²=16+4
c²=20
c=√20
c=√4*5
c=2√5
focus=(h,k±c)=(1,±2√5)

asymptotes are the line through center (1,0)
with slope %22%22+%2B-a%2Fb = %22%22+%2B-+4%2F2 = ±2
Use point slope form.
They are y = 2x-2 and y = -2x+2 

For the hyperbola on the right:

center=(h,k)=(2,3)
vertices=(h±a,k)=(4,3)&(0,3)
focus=(h±c,k)
c²=a²+b²
c²=4+1
c²=5
c=2√5
focus=(h±c,k)=(2±√5,3)

asymptotes are the line through center (2,3)
with slope %22%22+%2B-b%2Fa = %22%22+%2B-+1%2F2
Use point slope form.
They are y = 1%2F2x+2 and y = -1%2F2x+4 


Edwin