Question

rahul has a lens of focal length -10cm what type of lens is this?​

Answer 1

Let the zeroes of the quadratic polynomial be α = 3 , β = – 3 Then, α + β = 3 + ( – 3) = 0 αβ = 3 × ( – 3) = – 9 Sum of zeroes = α + β = 0 Product of zeroes = αβ = – 9 Then, the quadratic polynomial = x2 – (sum of zeroes)x + product of zeroes = x2 – (0)x + ( – 9) = x2 – 9.