Question

Find f(x+deltax) for f(x) = x^2 -2x-3

Answer 1

let be Dx = deltax
if f(x) = x^2 -2x-3, so f( x +Dx) = (x +Dx)² - 2(x +Dx) -3=x² + D²x +2x .Dx - 2x - 2Dx -3

f( x +Dx) =x² + D²x +2(x -1)Dx - 2x -3