8.
在平面直角坐标系内,点\(A(0,1)\),\(B(0,-1)\),\(C(1,0)\),点\(P\)满足\( \overrightarrow{AP}\cdot \overrightarrow{BP}=k| \overrightarrow{PC}|^{2}\).
\((1)\)若\(k=2\),求点\(P\)的轨迹方程;
\((2)\)当\(k=0\)时,若\(|λ \overrightarrow{AP}+ \overrightarrow{BP}|_{max}=4\),求实数\(λ\)的值.