Question

(4x - 1)^2 = 25.9

Ai giúp tớ với..

Answer 1

\(\left(4x-1\right)^2=25.9\\ \Leftrightarrow\left(4x-1\right)^2=225\\ \Leftrightarrow\left[{}\begin{matrix}\left(4x-1\right)^2=15^2\\\left(4x-1\right)^2=\left(-15\right)^2\end{matrix}\right.\\\Leftrightarrow\left[{}\begin{matrix}4x-1=15\\4x-1=-15\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}4x=16\\4x=-14\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=4\\x=-\dfrac{7}{2}\end{matrix}\right.\)

Answer 2

(4x-1)^2=(5/3)^2

Suy ra: 4x-1=5/3

4x=5/3+1

4x=8/3

X=8/3:4

X=....

 

 

Answer 3

(4x-1)^2= 15^2 
suy ra: 4x-1=15

4x= 16

X=4

Answer 4

cảm ơn mng ạ.