Question

if (x-1) is a factor of x^2+2x+k,
what is the number k ?
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Answer 1

Answer:

since (x-1) isa factor of x^2+2x+k

x=1

1+2+k=0

k=-3

Answer 2

Answer:

given polynomial is x^2+2x+k, and x-1 is a factor of given polynomial.

therefore, x^2+2x+k=o

or 1^2+(2×1)+k=0 (since x-1=0, or X=1)

or 1+2+k=0

or 3+k=0

or k=-3

Answer.