Question

Please tell me answer, if you can plz explain. Q stands for Rational numbers, R for real numbers, and C for complex numbers. If you troll I report.

Answer 1

Step-by-step explanation:

in quadratic equation

$a {x}^{2} + bx \: + c \: = 0$

product of the roots(pq) = c/a

comparing the general eqn with the given eqn

c = 2k^2 -1

a = 1

c/a = 7 {given in ques}

(2k^2 - 1)/1 = 7

solving this you will get your ans.