Question bank/JEE Main/Mathematics

JEE MainMathematicsToughInequalities and absolute value

The number of positive integral values of x satisfying the
inequality

(3x−5x)(x−2)(x2+5x+2)≥0\frac{\left( 3^{x} - 5^{x} \right)(x - 2)}{\left( x^{2} + 5x + 2 \right)} \geq 0
is

Show answer and solution
(3x−5x)(m−2)x2+5x+2≥0\frac{\left( 3^{x} - 5^{x} \right)(m - 2)}{x^{2} + 5x + 2} \geq 0
For
x>0  x > 0\;
3x−5x<0⇒−ve 3^{x} - 5^{x} < 0 \Rightarrow - ve\
x+5x+2>0⇒+vex + 5x + 2 > 0 \Rightarrow + ve
⇒x−2≤0\Rightarrow x - 2 \leq 0
⇒x≤2\Rightarrow x \leq 2
⇒x∈(0,2]\Rightarrow x \in (0,2\rbrack
Integer values = 1, 2

Source: Grass-G / M-05 Mathematics Paper 10 October.docx

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