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Cube and Cube Roots — MATHS STD 8 — Question

Gujarat BoardEnglish MediumSTD 8MATHSCube and Cube Roots1 Mark
MCQ
Which of the following is correct?
  • A
    Cube of a negative number is always positive.
  • ✓
    Cube of a negative number is always negative.
  • C
    Cube of a negative number may be positive or negative.
  • D
    All of the above.
✓

Answer

Correct option: B.
Cube of a negative number is always negative.
Multiplication of three negative numbers (i.e. the cube), will always be negative.
Eg: $(-4)^3$
$= -4 \times -4 \times -4$
$= 16 \times -4 = -64,$ which is negative.

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