Determinan dari (√x-1 4) (-√y-1 2)

[tex]\displaystyle A=\left[\begin{array}{ccc}\sqrt{x-1}&4\\-\sqrt{y-1}&2\end{array}\right]\\\\D=ad-bc\\D=\sqrt{x-1}\cdot2-4\cdot(-\sqrt{y-1})\\\boxed{\boxed{D=2\sqrt{x-1}+4\sqrt{y-1}}}[/tex]