6x 4y y 5 -2 3x 6 how can I solve this

Is this a polynomial function? i need to know asap

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

How many zeros does this polynomial function, y=(x-8)(x+3)^2