BPT $\Leftrightarrow (x-3)\sqrt{x^2+4}<(x-3)(x+3)$+) $x>3$ BPT $\Leftrightarrow \sqrt{x^2+4}+) $x<3$BPT $\Leftrightarrow \sqrt{x^2+4}>x+3\Leftrightarrow ...........$''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Safe and Sound ; https://www.youtube.com/watch?v=mTSOwdcefQw(sửa dùm)
BPT $\Leftrightarrow (x-3)\sqrt{x^2+4}<(x-3)(x+3)$+) $x>3$ BPT $\Leftrightarrow \sqrt{x^2+4}+) $x<3$BPT $\Leftrightarrow \sqrt{x^2+4}>x+3\Leftrightarrow ...........$''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Safe and Sound
BPT $\Leftrightarrow (x-3)\sqrt{x^2+4}<(x-3)(x+3)$+) $x>3$ BPT $\Leftrightarrow \sqrt{x^2+4}+) $x<3$BPT $\Leftrightarrow \sqrt{x^2+4}>x+3\Leftrightarrow ...........$''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Safe and Sound
; https://www.youtube.com/watch?v=mTSOwdcefQw(sửa dùm)