(a) Find the least value of 'a' so that $\text{f(x) = 2x}^2 - \text{ax} + 3$ is an increasing function on $[2, 4]$. OR (b) If $\text{f(x) = x} + \frac{1}{\text{x}}, \text{x} \geq 1$, show that f is an increasing function.

Year	Paper Code	Set	Position
CBSE 2025	Series 65-4	Set 1	Question 22
CBSE 2025	Series 65-4	Set 2	Question 24
CBSE 2025	Series 65-4	Set 3	Question 24

• Step 1: Stating the fundamental formula / law statement (+1 Mark)
• Step 2: Intermediate mathematical substitution or proof steps (+1 Mark)
• Step 3: Correct final value or conclusion with mandatory SI units (+1 Mark)