Answer
x= -7 or 6
Work Step by Step
Factor the trinomial.
x$^2$+x-42=0
(x+7)(x-6)=0
Set each variable factor as equal to zero and then isolate the variable to find the solutions.
x+7=0 or x-6=0
x=-7 or x=6
Enter the original equation into your graphing utility to observe that the graph crosses the x-axis at -7 and 6.