3*(9 в степени х ) - 28 * (3 в степени х) +9=0. Created by sunisbeautiful. algebra-ru

3*(9 в степени х ) - 28 * (3 в степени х) +9=0...

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August 2022 1 26 Report

3*(9 в степени х ) - 28 * (3 в степени х) +9=0

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ShirokovP

Verified answer

3*9^x - 28*3^x + 9 = 0
3^x = t ==>
3t^2 - 28t + 9 = 0
D = 26^2
t1 = (28 + 26)/6 = 9
t2 = 2/6 = 1/3

3^x = 9
x = 2

3^x = 1/3
x = - 1

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