\(\Rightarrow\left(x+\frac{1}{5}\right)^2=\frac{26}{25}-\frac{17}{25}\)
\(\Rightarrow\left(x+\frac{1}{5}\right)^2=\frac{9}{25}\)
\(\Rightarrow\left[\begin{array}{nghiempt}x+\frac{1}{5}=\frac{3}{5}\\x+\frac{1}{5}=-\frac{3}{5}\end{array}\right.\)\(\Rightarrow\left[\begin{array}{nghiempt}x=\frac{2}{5}\\x=-\frac{4}{5}\end{array}\right.\)
(x+1/5)^2+17/25=26/25
(x+1/5)^2=26/25-17/25
(x+1/5)^2=9/25
\(\Rightarrow\) (x+1/5)^2=(3/25)^2 hoặc (+1/5)^2=(-3/25)^2
⇒x+1/5=3/5 hoặcx+1/5=-3/5
TH1:x+1/5=3/5 TH2:x+1/5=-3/5
x=3/5-1/5 x=-3/5-1/5
x=2/5 x=-4/5
Vậy x∈(2/5;-4/5)
