true or false

Question

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 

Answer 1

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.