1. The following two equations describe the height of a missile above (or below) the surface of the ocean, when it is launched from a submarine:

1. $ y = -t^2 + 12t - 20 $
2. $ y = -5t^2 + 30t - 20$

2. After how many seconds will each missile break through the surface of the water?
3. After ...

Factoring with quadratic equation

Factoring

Determine what values of x will make y equal to zero:

1. $y = x^2 + 8x + 16$
2. $y = x^2 - 4x - 32$
3. $y = x^2 - 7x + 12$
4. $y = 2x^3 -10x^2 - 28x$

Operations with polynomials