Given the function rule f(x)= x^-2 - 4x + 3, what is the output of f(-3)?

a. 24
b. 21
c. 0
d. -3

the answer is a but why?

Can someone answer this question for me

Graph the system of inequalities presented here on your own paper, then use your graph to answer the following questions: y > 2x + 3y is less than negative 3 over 2 times x minus 4part a: describe the graph of the system, including shading and the types of lines graphed. provide a description of the solution area. (6 points)part b: is the point (â’4, 6) included in the solution area for the system? justify your answer mathematically. (4 points)

30 points if you answer all 3 questions with work!