1. x2+y2+z2-x-y-z=0
2. x2+y2+z2-2x-2y-2z=0
3. x2+y2+z2+2x+2y+2z=0
4. x2+y2+z2+x+y+z=0
x2+y2+z2-x-y-z=0
1. x2+y2+z2=16
2. x2+y2+z2=8
3. x2+y2+z2=4
4. x2+y2+z2=32
x2+y2+z2=16
1. 49
2. 5
3. -7
4. √7
√7
1. 4x-6y+5=0
2. 4x-6y+9=0
3. 4x-6y+11=0
4. 4x-6y+7=0
4x-6y+5=0
1. 5/12
2. 7/3
3. 12/5
4. 3/7
12/5
1. x+y-5=0
2. x-y+2=0
3. x-y+4=0
4. x-y-1=0
x-y-1=0
1. x2+y2-2xy+8x+8y-16=0
2. x2+y2-2xy+8x+8y=0
3. x2+y2+8x+8y-16=0
4. x2-y2+8x+8y-16=0
x2+y2-2xy+8x+8y-16=0
1. 2
2. 1
3. 0
4. 3
0
1. 1/√17
2. 1/4
3. 1/5
4. 2/17
1/√17
1. a2-k2
2. √(k2-a2)
3. √( a2+k2)
4. √( a2-k2)
√( a2-k2)