find domain and range of f(x)=square root ofx2-25
F(x)=square root of X2 -25, Since it is in square root, thus for solution to be real, X2 > 25 ( square root of negative no. is complex)
X2 > 25, x>5 and x<-5. So domain= (-infinity,-5] U [5,infinity). Since squareroot of positive no. is always positive, thus Range= [0,infinity)
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