Question

Find the value of k such that the polynomial x2 – (k+6) x + 2 (2k − 1) has sum of its

zeroes equal to half of the product of its zeroes.​

Answer 1

Answer:

Let the roots be α,β

For a quadratic equation ax

2

+bx+c=0

Sum of roots α+β=k+6⋯(1)

Product of roots αβ=4k−2⋯(2)

According to question,

α+β=

2

αβ

From (1),(2)

⟹k+6=2k−1

⟹k=7