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b. f(a) = 8 -->
a^2-1 = 8
a^2 -9=0
(a-3) (a + 3) =0
a= 3 atau a = -3
c. f (-5) = (-5)^2 - 1= 25-1 =24
maka 5- f(-5 )= 5-24=19
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keterangan : ^ = pangkat
a. F(5)=5²-1=24
b. (5)-f(-5)=(5)-{(-5)²-1}=(5)-24=(-19)
c. F(a)=8
a²-1=8
a²=8+1
a=√9
a=3