Answer:
n = 1, -9/2
Step-by-step explanation:
[tex]2n^2 + 7n - 9=0[/tex]
[tex]2n^2 - 2n + 9n - 9=0\\2n (n - 1) + 9(n - 1)=0\\(n-1)(2n+9)=0[/tex]
[tex]n-1=0\\or \\2n+9=0[/tex]
[tex]n = 1, -9/2[/tex]
