Question

Which of the following is the LCM of the polynomials?
(x2 + 10x + 9) and (x2 - 1)

A.(x + 1)
B.(x + 1)( x + 9)
C.(x + 1)(x - 1)
D.(x + 1)(x - 1)(x + 9)

Answer 1

a

Answer 2

well, you have to factor both to find out:

x^2+10x+9=(x+1)(x+9)

x^2-1=(x+1)(x-1)

Thus we can easily see that your LCM is (x+1)