Question

Find the value of K , if -1 is the zero of the polynomial p(x) = 2x^2-4x+k.

Answer 1

Answer:

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

2+4+k=0

6+k=0

k=-6

Answer 2

Hey friend,

Here is the solution :-

$p( - 1) = 2( { - 1)}^{2} - 4( - 1) + k = 0 \\ \\ p( - 1) = 2(1) - 4( - 1) + k = 0 \\ \\ p( - 1) = 2 + 4 + k = 0 \\ \\ p( - 1) = 6 + k = 0 \\ \\ p( - 1) = k = - 6 \\ \\ here \: we \: get \: \: \: \: \: k = - 6$

I hope this will help you....