Question

find the roots of quadratic equation​

Answer 1

ax^2+bx=0

x(ax+b)=0

x=0. or ax+b=0

x=0 or x=-b/a

these are the roots

Answer 2

option a is correct..
by taking common,

=>x(ax+b)=0
so, x=0 and x=-b/a

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