Answer: 
Step-by-step explanation:
Given
Quadratic equation is

Solving by completing the square method

The solution set of the equation is 
Answer: $4.50 per candle
Step-by-step explanation:
$32.55 - $17.50 - $1.55 = $13.50 for all the candles
To find the price of a single candle we divide our answer by 3
13.50/3 = $4.50