1. (l1+l2,m1+m2,n1+n2)
2. (l1+l2/3, m1+m2/3,n1+n2/3)
3. (l1+l2/√2, m1+m2/√2,n1+n2/√2)
4. (l1+l2/√3, m1+m2/√3,n1+n2/√3)
(l1+l2,m1+m2,n1+n2)
1. -7
2. 8
3. 5
4. 4
5
1. both have real roots
2. both have imaginary roots
3. at least one has real root
4. at least one has imaginary roots
at least one has real root
1. 2
2. 4
3. 6
4. 8
4
1. x2+x+1=0
2. x2+x+2=0
3. x2+2x+2=0
4. x2+2x+3=0
x2+x+2=0
1. xy=c2
2. x2+y2=c2
3. x2-y2=c2
4. x2-y2=1
xy=c2
1. 0,1
2. -1,2
3. 0,-1
4. -1,1
0,-1
1. A.P
2. G.P
3. H.P
4. A.G.P
H.P
1. -4
2. 2
3. -6
4. 5
-6
1. (3,-77)
2. (-3,77)
3. (2,25)
4. (25,2)
(-3,77)