What is the maximum value of the expression $-5r^2 + 40r - 12$ for real $r$?
Question:
What is the maximum value of the expression $-5r^2 + 40r - 12$ for real $r$?
Answer:
Let's think step by step.

user
68
What is the maximum value of the expression $-5r^2 + 40r - 12$ for real $r$?
train