Question

if x=3 is the solution of
1 point
x^2+kx+15, value of k is *
3
8
-8
none of these​

Answer 1

Answer:

k = -8, when x = 3 is a solution of p(x)

Step-by-step explanation:

We are given,

p(x) = x² + kx + 15

and x = 3 is a solution of p(x)

If x = 3 is a solution of p(x)

then by factor theorem p(3) = 0

Thus,

p(x) = x² + kx + 15

when x = 3,

p(3) = 3² + k(3) + 15

0 = 9 + 3k + 15

0 = 3k + 24

3k = -24

k = -24/3

k = -8

Thus,

k = -8, when x = 3 is a solution of p(x)

Hope it helped and believing you understood it........All the best