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Maths Problem, Call for Help!

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Maths Problem, Call for Help!
已知f(x)是一次函数,且f[f(x)〕＝16x-25,则f(x)=?
已知f(x)是一次函数，且f[f(x)〕＝16x-25，则f(x)=？
要有过程~
答案是4x-5或-4x+25／3
设之为ax+b
则a^2 x +ab + b=16x-25
则x=4或-4 b=-5或25/3
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