Question

If (-1) is a zero P(x) = 3x- 7x + 10k then value of k is

Answer 1

Answer:

k = -1

Step-by-step explanation:

P(x) = 3x² - 7x + 10k

When x = -1, P(x) = 0 :

3(-1)² - 7(-1) + 10k = 0

3 + 7 + 10k = 0

10 + 10k = 0

10k = -10

k = -10 ÷ 10

k = -1

Answer: k = -1

Answer 2

Given:

P ( x = -1 ) = 0

P ( x ) = 3 x^2 - 7 x + 10 k

To find:

k

Solution:

Substituting x = -1

3 ( -1 )^2 - 7 ( -1 ) + 10 k = 0

3 + 7 + 10 k = 0

10 + 10k = 0

k = -10 ÷ 10

k = -1

Hence, k = -1