Find the range of values of k such that the equation kx^2 - x - 1 = 0 has no real roots

What is the product? a-3/15a × 5/a-3

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 do i simply this radical expression?