Question

If 2 is a zero of the polynomial x²-kx+8, then k=​

Answer 1

Answer:

put x=2 in given polynomial.

then, 2^2 -k(2)+8 =0

4-2k+8=0

2k=12

k=6

Answer 2

it means the value of x=2

2×2-k×2+8=0

4-2k+8=0

12-2k=0

-2k=-12

k=-12/-2

k=6