Question

7^(2x-6)=49

Answer 1

Sửa đề:

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

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

\(\Rightarrow2x-6=2\)

\(2x=2+6\)

\(2x=8\)

\(x=8:2\)

\(x=4\)

Answer 2

7^{2x - 6} = 49

7^{2x - 6} = 7² (cùng cơ số)

⇒ 2x - 6 = 2

2x = 2 + 6

2x = 8

x = 8 : 2

x = 4