Answer:
Full proof below
Step-by-step explanation:

Answer:
C
Step-by-step explanation:
Given
f(x) = x² + x + 1
To express in vertex form use the method of completing the square
add/subtract ( half the coefficient of the x- term)² to x² + x
x² + 2(
)x +
-
+ 1
= (x +
)² +
→ C
Answer:
3 is yes -10 is no -6 is no and 0 is yes
Answer:
C) any eqaution that has a variable or number squared is a qaudratic equation