Question

if 9x2+kx+1=0 has equal roots then find the value of k
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Answer 1

Answer:

The given equation if 9x

2

+kx+1=0

comparing with ax

2

+bx+c=0

here a=9, b=k , c=1

△ = b

2

−4ac

= k

2

−4(9)(1)

= k

2

−36

The roots are equal so △ must be zero

∴ = k

2

−36=0

= (x+6)(x−6)=0

=x+6=0 or x−6=0

∴ k=−6 or k=6

Answer 2

hope it helps

good day

purple ya