BPT ⇔(x−3)√x2+4<(x−3)(x+3)+) x>3 BPT ⇔√x2+4+)x<3BPT\Leftrightarrow \sqrt{x^2+4}>x+3\Leftrightarrow ...........$''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Safe and Sound
BPT
⇔(x−3)√x2+4<(x−3)(x+3)+)
x>3 BPT
⇔√x2+4+)x<3
BPT\Leftrightarrow \sqrt{x^2+4}>x+3\Leftrightarrow ...........$''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Safe and Sound
; https://www.youtube.com/watch?v=mTSOwdcefQw(sửa dùm)