Решите уравнения. А) (Х+3)^2 -2 (х+3)-8=0 Б) 3^х+3^х-3=12. Created by Agata045. matematika-ru

Решите уравнения. А) (Х+3)^2 -2 (х+3)-8=0 Б) 3^х+3^х-3=12...

July 2022 2 8 Report

Решите уравнения. А) (Х+3)^2 -2 (х+3)-8=0
Б) 3^х+3^х-3=12

Verified answer

A
x+3=a
a²-2a-8=0
a1+a2=2 U a1*a2=-8
a1=-2⇒x+3=-2⇒x=-5
a2=4⇒x+3=4⇒x=1
Б
3^(x-3)*(27+1)=12
3^(x-3)*28=12
3^(x-3)=3/7
x-3=log(3)(3/7)
x=3+1-log(3)7
x=4-log(3)7

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