Determine whether or not the following functions from real numbers to real numbers are bijections (I don't need help with this part), and explain why or why not (I need help with THIS part).

a) $\displaystyle f(x)=-4x+5$ (Bijective)

b) $\displaystyle f(x)=2x^3-11$ (Bijective)

c) $\displaystyle f(x)=3x+2$ (Bijective)

d) $\displaystyle f(x)=|4x^3-5|$ (Not bijective)

e) $\displaystyle f(x)=2x^4-5$ (Not bijective)

The main issue I'm having with this problem is proof presentation. I don't exactly know how toexplainwhether or not a function is bijective or not.

Of course, if I've made a mistake, I'd appreciate it if you let me know.