Free Points U want some only for begianers

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

Find the zeros of each function. f(x) = x^2 + 5x - 6

Formulate the indicated conclusion in nontechnical terms. be sure to address the original claim. the foundation chair for a hospital claims that the mean number of filled overnight beds is over 523, and she is therefore justified starting a funding campaign to add a wing to the hospital. assuming that a hypothesis test has been conducted and that the conclusion is failure to reject the null hypothesis, state the conclusion in nontechnical terms.