Question 45774
3(n-1)^2+20=19(n-1)

3(n-1)^2+20=19n-19

3(n^2 - 2n + 1) +20 = 19n - 19

3n^2 - 6n + 3 + 20 = 19n - 19

3n^2 - 25n + 42 = 0

*[invoke quadratic "x", 3, -25, 42 ]