a, \(\left(2x+5\right)^2=\left(2x-5\right)^2\)
\(\Leftrightarrow4x^2+20x+25=4x^2-20x+25\)
\(\Leftrightarrow40x=0\)
\(\Leftrightarrow x=0\)
Vậy x = 0
b, \(x^2+10x+25=0\)
\(\Leftrightarrow\left(x+5\right)^2=0\)
\(\Leftrightarrow x=-5\)
Vậy x = -5
c, \(x^2-12x=-36\)
\(\Leftrightarrow x^2-12x+36=0\)
\(\Leftrightarrow\left(x-6\right)^2=0\)
\(\Leftrightarrow x=6\)
Vậy x = 6