Question

If one zero of the quadratic polynomial, (k - 1) x square + kx + 1 is -4 then the value of k is:
a) -5/4
b) 5/4
c) -4/3
d) 4/3
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Answer 1

Answer:

since -4 is the zero of the polynomial

(k - 1)(-4)^2 -4k + 1 = 0

16k - 16 - 4k + 1 = 0

12k - 15 = 0

k = 5/4

so option (b) is correct

Answer 2

Answer:

Hello There,

The correct option is B.

Step-by-step explanation:

P ( -4) = (k- 1)( - 4)² + k ( - 4 ) + 1 = 0

= (k - 1)16 - 4k + 1 = 0

= 16k - 16 - 4k + 1 = 0

= 12k - 15 = 0

= 12k = 15

k = 15 / 12

k = 5 / 4

The correct option is B) 5 / 4