Mathematics · Functions

JEE Main 2026 — 2 April, Morning Shift — Question 37

If the domain of the function f(x)=log⁡0.6(2x−5x2−4)f(x) = \log_{0.6}\left(\frac{2x-5}{x^2-4}\right) is (−∞,a]∪{b}∪[c,d)∪(e,∞)(-\infty, a] \cup \{b\} \cup [c,d) \cup (e,\infty), then the value of a + b + c + d + e is _____.

Answer: 4

Numerical answer — enter this value.

Step-by-step solution

For domain log⁡0.6∣2x−5x2−4∣≥0\log _{0.6}\left|\frac{2 \mathrm{x}-5}{\mathrm{x}^{2}-4}\right| \geq 0 ∣2x−5x2−4∣≤1&x≠52…\left|\frac{2 x-5}{x^{2}-4}\right| \leq 1 \& x \neq \frac{5}{2} \ldots. −1≤2x−5x2−4≤1-1 \leq \frac{2 \mathrm{x}-5}{\mathrm{x}^{2}-4} \leq 1 2x−5x2−4+1≥0\frac{2 \mathrm{x}-5}{\mathrm{x}^{2}-4}+1 \geq 0 x2+2x−9x2−4≥0\frac{\mathrm{x}^{2}+2 \mathrm{x}-9}{\mathrm{x}^{2}-4} \geq 0 (x+1)2−10(x−2)(x+2)≥0\frac{(x+1)^{2}-10}{(x-2)(x+2)} \geq 0

\mathrm{x} \in(-\infty,-1-\sqrt{10}] \cup(-2,2) \cup[-1+\sqrt{10}, \infty) \end{gathered}$$ $\frac{2 x-5}{x^{2}-4}-1 \leq 0$ $\frac{2 x-5-x^{2}+4}{x^{2}-4} \leq 0$ $\frac{\mathrm{x}^{2}-2 \mathrm{x}+1}{\mathrm{x}^{2}-4} \geq 0$ $\frac{(\mathrm{x}-1)^{2}}{(\mathrm{x}-2)(\mathrm{x}+2)} \geq 0$ $$\begin{gathered} \mathrm{x} \in(-\infty,-2) \cup(2, \infty) \cup\{1\} \end{gathered}$$ $(1) \cap(2) \cap(3)$ $\mathrm{x} \in(-\infty,-1-\sqrt{10}] \cup\{1\} \cup\left[-1+\sqrt{10}, \frac{5}{2}\right) \cup\left(\frac{5}{2}, \infty\right)$ $\mathrm{a}+\mathrm{b}+\mathrm{c}+\mathrm{d}+\mathrm{e}=-2+1+5=4$
Solution figure

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Exam
JEE Main 2026
Subject
Mathematics
Chapter
Functions
Topic
Domain & range of functions
If the domain of the function f(x) = log 0.6 (2x-5/x 2-4 ) is (-∞, a]… | JEE Main 2026 PYQ with Solution · DhiX AI