f(2)=0 f'(0)=20 請問如何求出f'(2)?? 答案為20?

If 0--->20
Then 20-<----0
Therefore(f(20))=f=20

F(2)=0, F'(0)=20, F'(2)=?? 答案為20

兩ㄍ方程式可以解兩ㄍ未知數

=> 一次方程式有兩ㄍ待定係數

=> F(x) = ax + b

=> F'(x) = a

=> F'(0) = a = 20

=> a = 20

=> F'(2) = F'(0) = a = 20

=> Answer = 20