Question

If the equation 9xpower2 +kc+1=0 then find k​

Answer 1

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