Question 1124608

{{{f(a+h) -f(a)= 5(a+h)^2+3(a+h)-3- (5a^2+3(a)-3)}}}
{{{f(a+h) -f(a)= 5(a^2+2ah+h^2)+3a+3h-3- 5a^2-3a+3}}}
{{{f(a+h) -f(a)= cross(5a^2)+10ah+5h^2+cross(3a)+3h-cross(3)- cross(5a^2)-cross(3a)+cross(3)}}}
{{{f(a+h) -f(a)= 5h^2+10ah+3h}}}