Question

If x=1 is the common root of ax2+bx+2=0 and x2+x+b=0 then ab=

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Answer 1

Answer:

a(1)^2 +b1 +2=0

a+b= -2 _____eq 1

1+1+b=0

b=-2____eq2

put eq 2 in eq1

a-2= -2

a=0

ab=0