Okay, I've got this question and I've spent about an hour trying to figure it out and it's doing my head in:
Write a formula for the nth term of this quadratic sequence:
7, 15, 27, 43, 63
nth term = ??
Write this expression in completed square form:
x² - 10x +2
x² - 10x +2 = -5
Ok, any help would be appreciated as I've tried many ways of doing it....