Which shows a difference of squares?
10y2 – 4x2
16y2 – x2
8x2 – 40x + 25
64x2 – 48x + 9

The total cost of anja’s trip to the dentist was $628.35. she paid a flat fee of $89.95 which included the checkup and cleaning and then had 4 cavities filled, each of which cost the same amount. which shows the correct equation and value of x, the cost of each cavity filling?

Find the zeros of each function. f(x) = x^2 + 5x - 6

Rhombus adef is inscribed into a triangle abc so that they share angle a and the vertex e lies on the side bc . what is the length of the side of the rhombus if ab=c, and ac=b.