Diketahui fungsi f:R ➡R dengan f(x)=x²-1. Tentukan :B.Rf jika Df={x|-3 < x <3 . C.Jika f(a)=3

f(x) = x² - 1
f(-2) = (-2)² - 1 = 3
f(-1) = (-1)² - 1 = 0
f(0) = 0² - 1 = - 1
f(1) = 1² - 1 = 0
f(2) = 2² - 1 = 3

f(a) = a² - 1 = 3
a² = 3 + 1 = 4
a = √4 = 2