Please:

if

f(x)=x^2-7x+6

and

g(x)= (x-1)(x^2+ax-2)

a)for which a afre graphs of the f and g functions in the (1,0) intersect under the angle of pi/4?

b) for which dots x tangent on graph of the function f in the point (x,f(x)) goes through the point (0,2)?

Many thanks!