Question

Tìm x biết: \(x^2-10x=-25\)

 

Answer 1

\(x^2-10x=-25\)

\(\Rightarrow x^2-2.5.x+25=0\)

\(\Rightarrow x^2-2.5.x+5^2=0\)

\(\Rightarrow\left(x-5\right)^2=0\)

\(\Rightarrow x-5=0\)

\(\Rightarrow x=5\)

Answer 2

\(x^2-10x=-25\)

\(\Leftrightarrow x^2-2.5x+25=0\)

\(\Leftrightarrow x^2-2.5x+5^2=0\)

\(\Leftrightarrow\left(x-5\right)^2=0\)

\(\Leftrightarrow x-5=0\)

\(\Leftrightarrow x=5\)

k nha

Answer 3

\(x^2-10x=-25\)

\(\Leftrightarrow x^2-10x+25=0\)

\(\Leftrightarrow\left(x-5\right)^2=0\)

\(\Leftrightarrow x-5=0\)

\(\Leftrightarrow x=5\)