(b) Luas sebuah segitiga bersudut tegak ialah (-2+20 \sqrt 3) cm^2. Satu daripada sisinya mempunyai panjang (8-2\sqrt3)cm. Cari panjang sisi yang berserenjang dengannya dalam bentuk a+b\sqrt3.
The area of right-angled triangle is (-2+20 \sqrt 3) cm^2. One of its sides has length (8-2\sqrt3)cm. Find the length of the side perpendicular to it in the form a+b\sqrt3.
I think you made a careless mistake where you missed out the 2 in (8- 2\sqrt 3).
Also, I noticed that there is a typing error in the question where the BM version says a+b\sqrt3 but the BI version says +b\sqrt3. Most probably the BM version is the correct one.
Here is my working for your reference:
Hope this helps!
Ohhh yahhh Thank you very much !