Suggest two reasons why smoking tobacco has decreased in the uk

2. x2 + 8x + 12 = 0 to prove: x = -6 or x = -2

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen