If a and b are unequal and x2+ax+b and x2+bx+a have a common factor, then:
If a not equal to b and x2+ax+b and x2+bx+a have a common factor, show that a+b+1=0
If the equations x2+bx+c=0 and x2+cx+b=0(b≠c) have a common root, then :