bagaimana cara menentukan nilai a ??

Lim √a + 4 / x - 3 = 3
x→5

√a + 4 / 5 - 3 = 3

√a + 4 / 2 = 3

√a + 4 = 6

√a = 6 - 4

√a = 2

a = 2²

a = 4