- #1
goonking
- 434
- 3
Homework Statement
9x2 − 18x + 4z2− 24z − y2 + 45 = 0
Homework Equations
The Attempt at a Solution
so let's start with the zy trace, setting x=0
we are left with:
4z2 - 24z - y2 = -45
completeing the square gives :
4z2 - 24z + 144 - y2 = -45 +144
4(z-12)2 - y2 = 99
divide both sides by 99
4(z-12)2 /99 - y2/99 = 1
so the center is at (12,0)? is a = sqrt of (4/99)?