Which expression is equivalent to (r -7 6?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

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

Use the given information to determine the exact trigonometric value.