Question 1168460
x-5 is a zero, or x-5 is one of the factors of 2x^4-5x^2+k;


If x-5 is a facotr then same as  saying  5 is a root.


{{{2*5^4-5*5^2+k=0}}}


{{{1125+k=0}}}


{{{k=-1125}}}