If the equations `x^(2)-bx+3=0` and `x^(2)-2bx+15=0` has one root common then value of b is ?

If the equations x^(2)-bx+3=0 and x^(2)-2bx+15=0 has one root common then the value of b is ?

If the equations ax^(2)+bx+c=0 and x^(2)+x+1=0 has one common root then a:b:c is equal to

If the equation x^(2)+x-b^(2)=0 and x^(2)-bx-1=0 have a common root then number of values of b is/are

If the equations 2x^(2)-7x+1=0 and ax^(2)+bx+2=0 have a common root, then

If the equation x^(2)+2x+3=0 and ax^(2)+bx+c=0 have a common root then a:b:c is

If the equations ax^(2)+bx+C=0 and x^(2)+2x+4=0 have a common root then find a:b:c

If the equations x^(2)+bx+c=0 and x^(3)+4x^(2)+7x+6=0 have two common roots,then value of (b+c) is equal to