3. Compute f(x)-f(a) ( where x a) for each of x-a the following functions. Simply your result. (a) f(x)-r (b) f(x)=x' fa)-f(a)-a x -a r-a x-a x-a x-a =x+a x2 + ax + a2 c)f(x)2x -3x+1 a)-)2-3x +1-(2a-3a+) x-a x-a f(a)2x-3x+1-2a'+3a-1 r-a r-a =2(x + a)-3 =2x+2a-3