18 square units should be the right answer
I don’t really understand this question so I will try to figure it out later
Answer:
Retracing your steps
Step-by-step explanation:
its (a) because (a) is C(x)=3x4+30x and 9+21 is 30 so its 3x2+30
I think it was √(a^2+b^2. I think.