QQuestion
The solution set for 0 < − \text{x}\over3 < 2, x ∈ Z is:
(a) {−5, −4, −3, −2, −1}
(b) {−6, −5, −4, −3, −2, −1}
(c) {−5, −4, −3, −2, −1, 0}
(d) {−6, −5, −4, −3, −2, −1, 0} bb
Exam-ready answer • 01 Mark
✓Answer
(a) {−5, −4, −3, −2, −1}
Explanation:
Given:
0 < – \text{x}\over3 < 2
⇒ 0 × 3 < – \text{x}\over3 × 3 < 2 × 3
⇒ 0 < – x < 6
⇒ – 1 × 0 > (- 1 )(- x) > – 1 × 6
⇒ −6 < x < 0
Since x ∈ Z, the solution set is {−5, −4, −3, −2, −1}.
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