Ответ:

1). f'=2х+3

2). f'(0)=2*0+3=3

f'(1)=2*1+3=5

f'(-1)=-2+3=1

f'(2)=4+3=7

f'(-2)=-4+3=-1

f'(3)=6+3=9

f'(-3)=-6+3=-3

3)2х+3=0

2х=-3

х=-3/2=-1 1/2

2х+3=1

2х=-2

х=-1

2х+3=3

2х=0

х=0