Factor out the minus sign
- 1+30

First, you need to find the greatest common factor, and because we are factoring out the minus sign, it should be a negative number.

For -1 & 30, the GCM is -1, and using the GCM, we can factor each of them out:
-1 30
/ \ / \
-1 x 1 -1 x 30

Then, we can use distributive property to factor out the minus with the GCM outside of the parentheses:

-1 + 30 =

-1(1 + 30)

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