(x+2)(x+6)=0

In the problem shown, to conclude that x+2=0 or x+6=0, one must use the:

Given: jk ||lm prove: _2 = 27 statement justification 1. jk ||lm 1. given 2.26 = 27 3.22 = 26 2. 3. 4. _2 = 27 4. corresponding angles theorem transitive property of equality vertical angles theorem substitution property of equality