A multi-product firm's cost function is estimated as TC= 450 + 6(Q1)(Q2) + 25(Q1^2) + 3(Q2) Another company has made an offer to buy the exclusive...

A multi-product firm's  cost function is estimated as

TC= 450 + 6(Q1)(Q2) + 25(Q1^2) + 3(Q2)

Another company has made an offer to buy the exclusive rights to produce product 2. Should the firm sell or not?  Show mathematically or explain in 6 sentences or less.

I asked this before but I messed up the equation.