You need to know these two formulas:

For example,

Answer:
18
Step-by-step explanation:
f(x) = 2x^2
Let x = -3
f(-3) = 2 * (-3)^2
Exponents first
f(-3)=2 *9
f(3) = 18
Answer:
the answer is -8 or 7
Step-by-step explanation:
Sorry im not good w negatives...
Answer: 14.88 is the answer
Step-by-step explanation: