In the activity Chap 5 Algebra... Different "Faces" of Algebra (II),
The total length of 4 roads is (3x - 1) km. What are the possible lengths of the 4 roads in kilometres?
The lengths of the 4 roads that Joshua Loh gave were:
- Road 1: x⁴÷ x³ km
- Road 2: x km
- Road 3: x - 46 km
- Road 4: 45 km
However, his answer is only true for some values of x.
- What values of x must his answers take so that the answers are true?
- Then why not other values of x?
Note: This is a 3-mark question.