Solve the following inequalities for x: $\frac{2x-3}{(x-2)(x-4)}≤0$ |
$\left(−∞,\frac{3}{2}\right]∪(2,4)$ $\left(\frac{3}{2},2\right)∪(4,∞)$ $(−∞,2)∪(4,∞)$ $(\frac{3}{2},4)$ |
$\left(−∞,\frac{3}{2}\right]∪(2,4)$ |
The correct answer is Option (1) → $\left(−∞,\frac{3}{2}\right]∪(2,4)$ Given $\frac{2x-3}{(x-2)(x-4)}≤0$. First, we note that $x≠ 2, 4$. Since $(x-2)^2 (x-4)^2 > 0$ for all $x ∈ R, x≠ 2, 4$. $\frac{2x-3}{(x-2)(x-4)}≤0⇒(2x-3)(x-2)(x-4)≤0$ $⇒2(x-\frac{3}{2})(x − 2) (x − 4) ≤ 0 ⇒ (x-\frac{3}{2}) (x − 2) (x −4) ≤ 0$ ...(1) Mark the numbers $\frac{3}{2},2$ and $4$ on the number line. By the method of intervals, the inequality (1) is satisfied when $x ≤\frac{3}{2}$ or $2≤x≤4$ but $x≠ 2, 4$. ∴ The solution set is $\left(−∞,\frac{3}{2}\right]∪(2,4)$. |