Because you an in partial products you add the numbers like regrouping your still adding in regrouping
Answer:
Step-by-step explanation:
B
When b=0
f(x)=ax^2+c
test each
A. with x^2-1, A is false
B. with -x^2-1, B is false
C. cannot find contradiction
D. the axis is actually x=0, 0 is nithere positive nor negative, false
answer is C
