Question

4x mũ 2-36=0

Answer 1

\(4x^{2}-36=0\\ \rightarrow 4x^{2}=36\\ \rightarrow x^{2}=9\\ \rightarrow x=3\)

Answer 2

4x^2-36=0

=>4x^2=36

=>x^2=9

=>x=+-3

Answer 3

\(4x^{2}-36=0\)

\(\Leftrightarrow\)\(4x^{2}=36\)

\(\Leftrightarrow\)\(x^{2}=9\)

\(\Leftrightarrow\)\(\left[\begin{array}{} x=3\\ x=-3 \end{array} \right.\)