Come si risolve a x^2 +b x^2 + c= 0

How is working backward similar to solving an equation?

Aclothing store has the sign shown in the shop window. pani sees the sign and wants to buy 3 shirts and 2 pairs of jeans. the cost of each shirt before the discount is $12, and the cost of each pair of jeans is $19 before the discount. write and simplify an expression to find the amount pani pays if a $3 discount is applied to her total

Answer pls man im trying to get out of summer school