Question

(6x - 7) ^ 4= 625

giúp mình

Answer 1

6x-7=5 hoặc 6x-7=-5

x=2 hoặc x=1/3

Answer 2

`(6x-7)^4=625=(5)^4=(-5)^4`

`=>[(6x-7=5),(6x-7=-5):}`

`=>[(6x=12),(6x=2):}`

`=>[(x=2),(x=1/3):}`

Vậy `x=2` hoặc `x=1/3.`

Answer 3

(6x - 7)⁴ = 625

⇔ 6x - 4 = 5

⇔ 6x = 9

⇔ x = \(\dfrac{9}{6}=\dfrac{3}{2}\)

Answer 4

Ta có: \(\left(6x-7\right)^4=625\)

\(\Leftrightarrow\left[{}\begin{matrix}6x-7=5\\6x-7=-5\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}6x=12\\6x=2\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=2\\x=\dfrac{1}{3}\end{matrix}\right.\)