On the day of the test, Rebeccas instructor says that the test will be to attempt 25 vases

Kylie explained that (-4x+9)^2 will result in a difference of squares because (-4x+9)^2 (-4x+9)^2 =(-4x)^2+(9)^2=16x^2+81

What is the value of p in the equation y^ = -4x?

The longer leg of a 30-60-90 trangle is 18