someone please help me work this problem out, this is very confusing.

Answer:
24
Step-by-step explanation:
You are basically inserting -4 into the function as x. It would be (-4)^2-2(-4) You can simplify it into 16 - (-8) or 24.
Answer:
24
Step-by-step explanation:
Well, f(-4) is the case in the formula when x=-4.
On that occasion, f(-4)=(-4)^2-2*(-4)=16+8=24