Question

If a nd b are the roots of ax^2+bx +c then evaluate lim (1 - vos(ax^2 + bx + c)/(x - b)^2

Answer 1

ax2+bx2-ay2-by2
=x2 (a+b)-y2 (a+b)
=(x2-y2)(a+b)
=(x+y) (x-y)(a+b)