f'(x)=3x^2-4ax+b
g'(x)=-4x+4
f(2)=8-8a+2b=0--------------------(1)
g'(2)=-8+4=-4
f'(2)=12-8a+b=-4------------------(2)
a=3 b=8
f'(x)=3x^2-4ax+b
g'(x)=-4x+4
f(2)=8-8a+2b=0--------------------(1)
g'(2)=-8+4=-4
f'(2)=12-8a+b=-4------------------(2)
a=3 b=8