Question 1156314


{{{(x^5*a-3)(x^9*a+7)}}}

{{{x^9*a*x^5*a+7*x^5*a-3*x^9*a-3*7}}}

{{{x^14*a^2+7*x^5*a-3*x^9*a-21}}}

{{{x^14*a^2+(7*x^5-3*x^9)*a-21}}}