Question

If x = 4 is the zero of the polynomial p(x) = 2x + k then find k.

Answer 1

Answer:

if x=4 is a zero of p(x)

then p(x) = 2x+ k , can be written as

p(4) = 2(4) +k

{as 4 is a zero of p(x) , p(4)= 0}

0 = 8+k

k= -8

therefore the value of k in p(x) is 4