Can someone help with this proof question pleaasee?

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Lina_Amiour
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I dont get how they get 5
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Last edited by Lina_Amiour; 1 month ago
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mqb2766
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If 2^2n was simply replaced with "x" you'd have
x + 4x = ...
Last edited by mqb2766; 1 month ago
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Lina_Amiour
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ohh oki get it now. thank you very much
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