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I need help with this question please. 

 

 May 20, 2019
 #1
avatar+28236 
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As follows:

 

 May 20, 2019
 #2
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I only didn’t understand the part where you wrote (9^2.h-h^3)! How did you get this please? 

 

Edit: GOT IT! Thank you :) :) 

Guest May 20, 2019
edited by Guest  May 20, 2019

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