Answer:
f(-1)=6
Step-by-step explanation:
Answer:
See Below.
Explanation:
Quadratic Form:

Quadratic Formula:

Based on the information given from the question, we can deduce:
a = 1
b = 6
c = -5
Now we can substitute all these values into the formula to find x.

Answer:
3=20
4=15
5=12
Step-by-step explanation:
Multiply first, then add. 12 times 7 = 84. Then add 8. 84 + 8 = 92.