Just need some help on these two.

Given f(x) = 2x^2- 5x+1, determine the function value f(2). do not f(x) = in your answer

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?

Rewrite the polynomial -9x5 + 36x4 + 189x3 in factored form.