Question

13. If x=l is a common root of ax2+ax+2=0 and x2+x+b=0 then ab=...
(a) 1 (b)2
(C)4
(d)3
​

Answer 1

Answer:

x=1 put in eqn

ax2+ax+2=0

a×1+a×1+2=0

2a=-2

a=-1

put x=1 in eqn

x2+x+B=0

1+1+B=0

B=-2

so ab =-1×-2=2ans

Answer 2

Answer:

ax^2+ax+2=0

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

a+a=-2

2a=-2

a=-1

x^2+x+b=0

(1)^2+(1)+b=0

1+1+b=0

2+b=0

b=-2

ab=a×b

ab=(-1)×(-2)

ab=2

so the (b)2

plz mark it brainlist