6.
已知\(M(4,0)\),\(N(1,0)\),曲线\(C\)上的任意一点\(P\)满足:\( \overrightarrow{MN}⋅ \overrightarrow{MP}=6| \overrightarrow{PN}|\)
\((\)Ⅰ\()\)求点\(P\)的轨迹方程;
\((\)Ⅱ\()\)过点\(N(1,0)\)的直线与曲线\(C\)交于\(A\),\(B\)两点,交\(y\)轴于\(H\)点,设\(\overrightarrow{HA} =λ_{1} \overrightarrow{AN}\),\( \overrightarrow{HB}=λ_{2} \overrightarrow{BN}\),试问\(λ_{1}+λ_{2}\)是否为定值?如果是定值,请求出这个定值;如果不是定值,请说明理由.