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a. bayangan 2 oleh h
h(2)= 2²-1
= 4-1
= 3
b. nilai h, untuk x=-2
h(-2)=(-2)²-1
=4-1
=3
c. bilangan a, hingga h(a)=124
h(a)=a²-1
124=a²-1
-a²=-1-124
-a²=-125
a²=125
a=√125
a=5√5