Question

7^2x-6=49

 

Answer 1

\(7^{2x-6}=49\)

\(=>7^{2x-6}=7^2\) hoặc \(7^{2x-6}=\left(-7\right)^2\)

\(=>2x-6=7\) hoặc \(2x-6=-7\)

\(=>2x=7+6\) hoặc \(2x=\left(-7\right)+6\)

\(=>2x=13\) hoặc \(2x=-1\)

\(=>x=\dfrac{13}{2}\) hoặc \(x=-\dfrac{1}{2}\)

Vậy \(x=\dfrac{13}{2}\) hoặc \(x=\dfrac{-1}{2}\)

\(#NqHahh\)

Answer 2

\(7^{2x-6}=49\)

\(\Rightarrow7^{2x-6}=7^2\)

\(\Rightarrow2x-6=2\)

\(\Rightarrow2x=2+6\)

\(\Rightarrow2x=8\)

\(\Rightarrow x=8:2=4\)

Answer 3

Mình xin sửa lại nha:

\(6^{2x-6}=49\)

\(=>7^{2x-6}=7^2\)

\(=>2x-6=2\)

\(=>2x=2+6\)

\(=>2x=8\)

\(=>x=8:2\)

\(=>x=4\)

 

 

Answer 4

7^2x-6=7^{2
2x-6=2
2x= 2 + 6
2x=8
x=8 : 2
x=  4
Vậy x=4}