Question

What Ticket prices will result in an income of $0?

Answer 1

100p-5p^2 = 0

Factor out 5p out of 100p and -5p^2:

5p(20) + 5p(-p) = 0

Factor:

5p(20-p)=0

Divide each term by 5:

p = 0

Set 20-p to 0 and solve for p:

p = 20

The answer is 0, 20