Question

tìm x sao cho 3 x\(^2\)\(\) - 6 = 0

Answer 1

Giải:

\(3x^2-6=0\)

\(\Leftrightarrow3\left(x^2-2\right)=0\)

\(\Leftrightarrow x^2-2=0\)

\(\Leftrightarrow x^2=2\)

\(\Leftrightarrow x=\pm\sqrt{2}\)

Vậy ...

Answer 2

\(3x^2-6=0\)

<=>\(3\left(x^2-2\right)=0\)

<=>\(x^2-2=0\)

<=>\(x^2=2\)

<=>\(x=\sqrt{2}\)

<=>\(x=-\sqrt{2}\)

=> Kết luận: Vậy...