Find the set of values of $k$ for which the expression $x^2 + (2 - k)x + 1$ is positive for all

Question

Find the set of values of $k$ for which the expression $x^2 + (2 - k)x + 1$ is positive for all real values of $x$.[4]

Accepted Answer

0 < k < 4

2024 YIJC H1 Q1