Answer:
The answer to your question is below
Explanation:
Part 1.- His mistake was that he drew the parabola upwards and it must be downwards.
Part 2.
x Substitution f(x)
-5 -(-5+2)² - 1 - 10
1 -(1 + 2)² - 1 - 10
2 -(2 + 2)² - 1 - 17
The value of f(x) is always negative indicating that the parabola goes downwards.