Answer :
For roots to be real D ≥ 0
⇒ b2 - 4ac ≥ 0
For x2 + 4x + k = 0,
⇒16 – 4k ≥ 0
⇒ – 4k ≥ - 16⇒4k ≤ 16
⇒k ≤ 4
Or
Consider 3x2 – 10x + k = 0,
Compare the given equation with the general equation ax2 + bx + c = 0
So, a = 3, b = -10, c = k
Let, the roots of the equation be x and 1/x.
Product of the roots
⇒ k = 3
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