Question 639388
The idea is to start with the outer function first. Then replace the input with the inner function.


a(x) = x^2-5


a(b(x)) = (b(x))^2-5 ... Replace ALL 'x' terms with b(x)


a(b(x)) = (6x+1)^2-5 ... Replace b(x) on the right side with 6x+1 (since b(x) = 6x+1)


I'll let you expand and simplify this.


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Now we reverse what we just did 


b(x)=6x+1


b(a(x))=6(a(x))+1


b(a(x))=6(x^2-5)+1


I'll let you simplify.