Question

(5.x-1)² = 16

"." Là dấu nhân nha

Answer 1

(5x-1)² =(4)²

=> 5x-1=4

     5x=5

      x=1

k mk nhé

Answer 2

\(\left(5.x-1\right)^2=4^2\)

\(=>\left(5.x-1\right)=4\)

\(=>5.x=5\)

\(=>x=1\)

Answer 3

5x - 1 = \(\orbr{\begin{cases}4\\-4\end{cases}}\)

 với 5x -1 = 4 => x= 1

với 5x-1 = -4 => x= -3/5

Answer 4

\(\left(5.x-1\right)^2=16\)

\(\left(5.x-1\right)^2=\left(+-4\right)^2\)

\(\cdot5.x-1=4\)

\(5.x=4+1=5\)

\(x=5:5=1\)

\(\cdot5.x-1=-4\)

\(5.x=-4+1=-3\)

\(x=-3:5=-0,6\)

Answer 5

\(\left(5x-1\right)^2=16\)

\(\left(5x-1\right)^2=4^2\)

\(5x-1=4\)

\(5x=4+1\)

\(5x=5\)

\(x=1\)

Answer 6

Ta có:16=4^2 nên:

    (5.x-1)^2=4^2

  =>  5.x-1=4

        5.x   =4+1

        5.x   =5

         x     =5:5

         x     =1

KB VS MIK NHA.......

Answer 7

(5x-1)²=16

<=>(5x-1)²-16=0

<=>(5x-1-4)(5x-1+4)=0

<=>(5x-5)(5x-3)=0

\(\orbr{\begin{cases}5x-5=0\\5x-3=0\end{cases}}\)

\(\orbr{\begin{cases}x=1\\x=\frac{3}{5}\end{cases}}\)