1. Find the value of x + 5 when x = 3.
- A8
- B15
- C2
- D53
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Answer: A) 8
Substitute x = 3: 3 + 5 = 8.
Class 7 Finding the Value of an Expression — practice questions with answers
Algebra · 5 sample questions from the school syllabus. Try each one, then open the answer and the worked solution.
2. Find the value of when x = 5.
- A3
- B4
- C2
- D6
Show answer
Answer: A) 3
= 3.
3. The temperature in Shimla at hour h is modelled by (20 - 2h) degrees Celsius, where h is the number of hours after noon.
What is the temperature 6 hours after noon (in degrees Celsius)?
What is the temperature 6 hours after noon (in degrees Celsius)?
- A9
- B8
- C16
- D7
Show answer
Answer: B) 8
20 - 2h = 20 - 2 x 6 = 20 - 12 = 8 degrees Celsius.
4. Find the value of -x² + 4x - 7 when x = -2.
- A-19
- B-18
- C-20
- D-38
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Answer: A) -19
-(-2)² + 4(-2) - 7 = -(4) - 8 - 7 = -4 - 8 - 7 = -19.
5. The expression for the surface contribution of a tile design is 2x² - 5x + 3xy - y².
Find its value when x = 3 and y = -2.
Find its value when x = 3 and y = -2.
- A-19
- B11
- C-7
- D1
Show answer
Answer: A) -19
2x² = 2(9) = 18; -5x = -15; 3xy = 3(3)(-2) = -18; -y² = -(-2)² = -4. Sum = 18 - 15 - 18 - 4 = -19.
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