The number of values of `a` for which equations `x^3+a x+1=0a n d x^4+a x^2+1=-` have a common root is a. `0` b. `1` c. `2` d. Infinite

The value of a for which the equation x^3+2ax+2=0 and x^(4)+2ax^(2)+1=0 have a common root is "

The value of a for which the equation x^(3)+ax+1=0 and x^(4)+ax+1=0 have a common root,is

The number of real values of lambda for which the lines x-2y+3=0,\ lambdax+3y+1=0\ a n d\ 4x-lambday+2=0 are concurrent is a. 0 b. 1 c. 2 d. Infinite

If a,b,c in R and the equation ax^(2)+bx+c=0 and x^(2)+x+1=0 have a common root,then

The number of values of a for which the lines 2x+y-1=0,ax+3y-3=0, and 3x+2y-2=0 are concurrent is 0(b)1(c)2 (d) infinite

If the equation x^(2)+bx-a=0 and x^(2)-ax+b=0 have a common root,then a.a +b=0 b.a=b c.a-b=1 d.a+b=1

The value(s) of k which the equation x^2-k x-21=0 a n d x^2-3kx+35=0 has a common root, may be: (a) +-1 (b) +-2 (c) +-4 (d) No of these