For my math nerds, can you help?

Select the quadratic that has root x = 8 and x = -5

Television sizes are based on the length of the diagonal of the television's rectangular screen. so, for example, a 70-inch television is a television having a diagonal screen length of 70 inches. if a 70 inch television's diagonal forms a 29°angle with the base of the screen, what is the vertical height (1) of the screen to the nearest inch? 70 inhin

What are the solutions of the equation x4 + 6x2 + 5 = 0? use u substitution to solve.