Question

Jika a dan b adalah bilangan bulat,serta
Lim
X » 2
X²-x-b/2-x=a
Maka b-a=...

Answer 1

Jika kita substitusikan x = 2 ke (x² - x - b)/(2 - x) hasilnya 0/0
⇒ (2² - 2 - b)/(2 - 2) = 0/0
⇒ 4 - 2 - b = 0
⇒ 2 = b

lim (x² - x - 2)/(2 - x) = lim (x - 2)(x + 1)/-(x - 2) = lim -(x + 1) = -(2 + 1) = -3 = a

b - a = 2 - (-3) = 5