Answer: 15a.) -2,2.
15b.) 0
15c.)infinite, one, zero
16.) check step-by-step
Explanation:
15a.) using the quadratic formula, or factoring, y=0 at x values -2 and 2.
15b.) By adding 4 to both sides, you get x^2=0, meaning the value of x is 0.
15c.) There are infinite values of x that give greater than -4, there is one value of x that is equal to -4, and zero less than -4
For question 16, I wont give the answer since i dont have time but just put all values on one side of the equations so you can use the quadratic formula.
Hope I helped,
- Chris