For the three part question provide answers to Part A, B and C. Part A: Explain what the roots of a function are and how to find them.
Part B: Calculate the zeros of the function y = -x² - 4x + 21.
Part C: Describe the graph of the function from Part B, including key characteristics of the function.

Ask your question to the AI advisor

Ai-bot is an expert in any field and is the perfect companion for reliable and useful answers and advice on a variety of topics, including science, history, technology, art, sports, health, culture and more.