Question

( x^{2}-a x+b=0 )
[
2 alpha=a quad alpha=frac{a}{2} quad alpha
]
[
begin{array}{l}
alpha^{2}-alpha x a+d=0
b-frac{a b}{2}+d=0 quad 2(b+d)=a c
end{array}
]

# Q.6 If the two equations x2 - cx + d = 0 and two equations x2 - 6x + d = 0) and x2 _ ax + b =0 have one common root and the second has equal roots, then 2(b + d) =

Solution