Question 420819


  {{{ f(a+h)=18(a+h)^2-8(a+h)+5 }}}

  {{{ f(a+h)=18( a^2+2ah+h^2)-8a-8h+5 }}}

  {{{ f(a+h)=18a^2+36ah+18h^2-8a-8h+5 }}}

  {{{ f(a+h)-f(a)=18a^2+36ah+18h^2-8a-8h+5-18a^2+8a-5 }}}

  {{{ f(a+h)-f(a)=2h*(9h^2+18a-4)}}}