Question

Which of the following is one of the factors of x2 – 13x + 12?

a. x + 12
b. x – 3
c. x – 1
d. x + 1

Answer 1

What two numbers multiply to give 12 and add to give 13?

Answer 2

12 and 1

Answer 3

How do 12 and 1 become -13?

Answer 4

well first you wrote 13 NOT -13.

Answer 5

Right, it's simply a change of sign. To get -13, you must add them together and they must both be negative. So your factors are (x-12)(x-1)

Answer 6

You can see here that when multiplying two negatives, the constant term also becomes positive.

Answer 7

c. thank you