Question

设f(x)=ax三次方+3x二次方+2,f(-1)=4,则a等于?

Answer 1

f(x)=ax三次方+3x二次方+2

f'(x)=3ax^2+6x

f'(-1)=3a(-1)^2+6*(-1)=4

3a-6=4

3a=10

a=10/3