2. f'=4-6x

f'(x₀)= f'(4)=4-6*4=-20

f(x₀)= f(4)=4*4-3*16=-32

y=f(x₀)+f'(x₀)*(x-x₀)

y=-32-20*(x-4)

y=-20x+80-32

y=-20x+48

3. (u/v)'=(u'v-uv')/v²

y'=(2*(x-2)-1*(2x-1))/(x-2)²=(2x-4-2х+1)/(x-2)²=-3/(x-2)²;

y'(-1)=-3/(-1-2)²=-3/9=-1/3