- A800 litres
- B2000 litres
- C6000 litres
- D8000 litres
Step-by-Step Solution
Volume = , and litres. The option 6000 litres comes from , multiplying the edge by 3 instead of cubing it.
Answer: D) 8000 litres
A cubical water tank has an edge of 2 m. Taking litres, how much water does the full tank hold?
Class 8Cubes and Cube RootsCubes and Roots
Key idea: Squares vs cubes — what's different
Both are repeated multiplication, but with key differences:
- A square is non-negative: .
- A cube **keeps the sign**: . (Three negatives stay odd → still negative.)
- Squares grow more slowly than cubes: vs For square roots, only positive results (by convention). For cube roots, the sign matches the input: ∛.
- A square is non-negative: .
- A cube **keeps the sign**: . (Three negatives stay odd → still negative.)
- Squares grow more slowly than cubes: vs For square roots, only positive results (by convention). For cube roots, the sign matches the input: ∛.
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