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true or false

enter T or F depending whether the function is one to one or not 
1) a(x)= 9x4-9x 
2) d(x) = (3x-8)^2+9 
3) e(x) = 9√(x+9)
4) c(x) = x-9/9+x
5) b(x) = 8x3-9x 
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1 Answer

1) False, because for each X, there is one value of a(x), but for any given value of a(x), there are 4 values of X.
2) False , for reason of 1) , any polynomial of even degree is not one to one function.
3) True  9√(X + 9) , square root is a positive number, only with one value,
4) True , ratio of 2 linear function is one to one, every one X there is only one value of Y.
5 ) True.