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5^(x+1)-2×5×5^(x-1)=15
5^(x+1)-2×5^x=15
factorizando por criterio de factor común:
5^x (5-2)=15
5^x×3=15
5^x=5
A bases iguales exponentes iguales:
➝x=1
ツ
5 . 5^x - 10 . 5^x / 5 = 15
5^x (5 - 2) = 15; 3 . 5^x = 15; o sea 5^x = 15/3= 5
Por lo tanto x = 1; verificamos:
5^(1 +1) - 10 5^(1 - 1) = 25 - 10 = 15
Saludos Herminio