Question

Find the value of k for which 3 is a zero of the polynomial x^2 -kx + 12.

Answer 1

Answer:

k =7

Step-by-step explanation:

first you have to replace xby 3 because 3 is a zero of the given polynomial

x^2 - kx +12

3^2 - k3 +12 = 0

9 - 3k + 12 = 0

21 - 3k = 0

-3k = 21

k = 21/3

k = 7

I hope it will help

pls mark brainliest

Answer 2

If 3 is the zero of the polynomial we need to take it as x

So,

(3)² - k(3) + 12 = 0

9 - 3k + 12 = 0

12 + 9 = 3k

21 = 3k

21 ÷ 3 = k

7 = k

Therefore the value of k is 7