(5x+1)2=36/49
Mà: (5x+1)2=36/49=(6/7)2 hoặc (5x+1)2=36/49=(-6/7)2
=>5x+1=6/7 hoặc 5x+1= -6/7
=> 5x= 6/7-1 hoặc 5x= -6/7 -1
=> 5x= -1/7 hoặc 5x= -13/7
=> x= -1/7: 5 hoặc x= -13/7: 5
=> x=-1/35 hoặc x= -13/35
(5x+1)2=36/49
Mà: (5x+1)2=36/49= (6/7)2
=>5x+1=6/7
=>5x=6/7-1
=>5x=-1/7
=>x= -1/7 : 5
=>x= -1/ 35
ta có:
\(\left(5x+1\right)^2=\frac{36}{49}\)
\(\Rightarrow\left(5x+1\right)^2=\left(\frac{6}{7}\right)^2\)
\(\Rightarrow5x+1=\frac{6}{7}\Rightarrow5x=\frac{-1}{7}\Rightarrow x=\frac{-1}{35}\)
(5x+1)2=36/49
(5x+1)2=(+-6/7)2
=>5x+1=+-6/7
=>TH1:5x+1=6/7
5x=-1/7
x=-1/35
=>TH2:5x+1=-6/7
5x=-13/7
x=-13/35
Vậy x E {-13/35,-1/35}
(5x+1)2=36/49
=>5x+1=6/7 hoặc 5x+1=-6/7
5x=6/7-1=-1/7 5x=-6/7-1=-13/7
x=-1/7:5 x=-13/7:5
x=-1/35 x=-13/35
