Can you help me with this please??

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0

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