Question

Tìm x

X² + 25 = 10x

Answer 1

x²+25=10x

25+x²=10x

25+(-10x)+x²=10x+(-10x)

25+(-10x)+x²=0

[5+(-1x)][5+(-1x)]=0

=>5+(-1x)=0

\(\Rightarrow x\in\left\{-5;5\right\}\)

Answer 2

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

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

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

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

\(\Rightarrow x-5=0\)

\(\Rightarrow x=5\)

vay \(x=5\)