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Exponents and Powers — MATHS STD 8 — Question

Gujarat BoardEnglish MediumSTD 8MATHSExponents and Powers1 Mark
MCQ
The value of $(-2)^{2 \times 3-1}$ is:
  • A
    $32$
  • B
    $64$
  • ✓
    $-32$
  • D
    $-64$
✓

Answer

Correct option: C.
$-32$
C.  $-32$
Solution:
Given,
$(-2)^{2 \times 3-1}=(-2)^{6-1} $
$=(-2)^5 $
$=(-2) \times(-2) \times(-2) \times(-2) \times(-2) $
$=-32$
[for $(-a)^m$, if $m$ is odd, then $(-a)^m$ is negative]

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