Question

Find the values of k that make 2x^2 + kx + 11 factorable.









A.

1 or 11








B.

11 or 13








C.

13 or 23








D.

2 or 11

Answer 1

K has to be the sum of two integers whose product equals 2*11, as Hero pointed out:
ac=2*11=22
k=sum of two integers whose product equals 22.

Answer 2

Just plug in the values for k, from the given solutions and see which ones work.

Answer 3

all quadratics are factorable ... is the domain restricted to reals by chance?