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Surds and Indices
If 5a = 3125, then the value of 5(a - 3) is:
25
125
625
1625
Correct Answer:
25
Explanation:
5
a
= 3125 ⟺ 5
a
= 5
5
⟹
a
= 5.
∴ 5
(
a
- 3)
= 5
(5 - 3)
= 5
2
= 25.
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