MCQ
The value of $(8^{-25} - 8^{-26})$ is:
- A$7 \times 8^{-25}$
- ✓$7 \times 8^{-26}$
- C$8 \times 8^{-26}$
- DNone of these
✓
Answer
Correct option: B.
$7 \times 8^{-26}$
$(8^{-25}-8^{-26})=\Big(8^\frac{1}{25}-8^\frac{1}{26}\Big)$
$=\frac{(8-1)}{8^{26}}=7\times8^{-26}$
$=\frac{(8-1)}{8^{26}}=7\times8^{-26}$
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