EXPLAIN: WHY MUST YOU MULTIPLY EACH TERM IN THE FIRST BINOMIAL BY EACH TERM IN THE SECOND BINOMIAL? This was in a assignment where we had to multiply and simplify two binomials together

Desmond wants to sell his car that he paid $8,000 for 2 years ago. the car depreciated, or decreased in value, at a constant rate each month over a 2-year period. if x represents the monthly depreciation amount, which expression shows how much desmond can sell his car for today? \ 8,000 + 24x 8,000 - 24x 8,000 + 2x 8,000 - 2x