(1 point) (a) Find the point Q that is a distance 0.1 from the point P=(6,6) in the direction of v=⟨−1,1⟩. Give five decimal places in your answer. Q= (

5.91862665

,

5.94187618

)

(b) Use P and Q to approximate the directional derivative of f(x, y)=x+3y−−−−−√ at P, in the direction of v.

fv≈

(c) Give the exact value for the directional derivative you estimated in part (b).

fv=