Solve the following inequalities for x:
$\frac{x + 3}{x-2}≤ 2$
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → $(−∞,2)∪[7,∞)$
Given $\frac{x + 3}{x-2}≤ 2$. First we note that $x≠2$
$⇒\frac{x + 3}{x-2}-2≤0$
$⇒\frac{x + 3-2(x-2)}{x-2}-2≤0$
$⇒\frac{-x + 7}{x-2}≤0⇒\frac{x - 7}{x-2}≥0$ (Since $(x-2)^2>0,∀x∈R,x≠2)$
$⇒(x-7)(x-2)≥0$ ...(1) (Multiplying by $(x-2)^2$)
Mark the numbers 2 and 7 on the number line. By the method of intervals, the inequality (1) is satisfied when $x ≤2$ or $x≥ 7$ but $x ≠ 2$
∴ The solution set is $(−∞,2)∪[7,∞)$.