1. 4n^2 - 25 ÷ 2n - 5 = ...
2. 3s^2 - 6s + 12 ÷ s^2 - 2s + 4 = ...
2. 3s^2 - 6s + 12 ÷ s^2 - 2s + 4 = ...
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( 2n + 5 ) ( 2n - 5 ) / 2n -5
= 2n +5
2. 3s² - 6s + 12 / s² - 2s + 4
3 ( s² - 2s + 4 ) / s² - 2s + 4
= 3