1) "find the vertex algebraically"(adsbygoogle = window.adsbygoogle || []).push({});

y= -x^2 - 3

y = (x - 3)(x+1)??

(the -x is throwing me off)

2) a movie theatre sells tickets for $8.5 each. they are considering raising the prices but know that for every 50 cents the price is raised, 20 fewer people go to the movies. R = -40c^2 + 84c

c = ticket cost

R = revenue

what should the theatre charge to maximize revenue?

for this one i can probably just use my graphing calculator to find the roots?. but what values should i put in the window? (new to using graphing calculator)

~Amy

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# Homework Help: Quick quadratic questions

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