i got 3.825 
your equation would be 
(2x-1)(x+7)=72 
when you distribute youd get 
2x^2 +13x -7 =72 
move the 72 over giving you 
2x^2 +13x -79=0 
i used the quadratic formula and the answer would be 3.825 because a negative answer wouldn’t make sense in this situation