Show that 2^(x+1) + 6(2^(x-1)) = 12 can be written as 2(2^(x)) + 3(2^(x)) = 12
I don't get it :(((
Logs Question help?
2020-09-10 10:36 pm
回答 (2)
2020-09-10 11:41 pm
✔ 最佳答案
Law of indices:nᵃ⁺ᵇ = nᵃ*nᵇ
nᵃ⁻ᵇ = nᵃ/nᵇ
2ˣ⁺¹ + 6(2ˣ⁻¹) = 12
2ˣ * 2¹ + 6(2ˣ/2¹) = 12
2(2ˣ) + 3(2ˣ / 2) = 12
2020-09-10 10:41 pm
2^(x+1) = 2^x * 2^1 = 2^x * 2 = 2 * 2^x.
Apply the same reasonings to 6(2^(x-1)).
All good?
Apply the same reasonings to 6(2^(x-1)).
All good?
收錄日期: 2021-04-24 08:00:18
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20200910143647AAq4a6W