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did i do this correct and if not can someone help me to do it correct and show me the steps so i know what i did wrong. thanks.

a^2+2a¡Ü15
(a+5)(a-3)¡Ü0
(a+5(a-3)¡Ü3
Solution is -5¡Üa¡Ü3

I cannot interpret your ¡Ü1 symbol.

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