Question

if x=1 is a zero of the polynomial f (x)=x2â’5x+k, then the value of k is

Answer 1

if X=1 is a zero of f(x)=x²+5x+k,

then
f(1)=0

hence

(1)² +5×1 +k=0,

1+5+k=0,

then

k=-6