Question 41:
The length of a side of a cube is (2x − 5) cm. What is total surface area of the cube?
Options :
- a) 6(4x² − 20x − 25)
- b) 4x² − 20x + 25
- c) 24x² − 120x + 150
- d) 6x² − 30x + 25
correct answer : c)
Explanation :
Total Surface Area of cube = 6 × (side)² = 6 × (2x – 5)² = 6 × (4x² – 20x + 25) = 24x² – 120x + 150.