Mohon bantuannya Paake cara nya

Rumus selisih akar kuadrat b-q/2√a
lim       √x²-3x+5-√(x-5)²
x→∞
lim       √x²-3x+5-√x²-10x+25
x→∞
b-q/2√a = -3-(-10)/2√1= -3+10/2= 7/2