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August 2022
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Решите уравнение 2*3^(x+1) - 4*3^(x-1) =42
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mmb1
Verified answer
2*3^(x+1) - 4*3^(x-1) =42
3^(x-1)=t
2*9*t-4t=42
18t-4t=42
14t=42
t=3
3^(x-1)=3^1
x-1=1
x=2
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Answers & Comments
Verified answer
2*3^(x+1) - 4*3^(x-1) =423^(x-1)=t
2*9*t-4t=42
18t-4t=42
14t=42
t=3
3^(x-1)=3^1
x-1=1
x=2