Answer:
Well, x=3, -3
Step-by-step explanation:
If you use a calculator you'll easily be able to figure this out.
Answer:
Step-by-step explanation:
Price assuming he bought all large flags: 
Amount of money more: 
Difference of price in both flags: 
Medium Flags: 
Large Flags: 
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The reason why this works, is because the amount of money more comes from the difference between both flags.
Step-by-step explanation:
Standard form of a quadratic is f(x) = ax² + bx + c.
To convert to vertex form, the simplest method is to find the x-coordinate of the vertex using h = -b/(2a).
Then, plug back into the equation to find the y-coordinate of the vertex. k = f(h).
Finally, the leading coefficient is the same as the standard form, a.
f(x) = a(x − h)² + k
Another method is to complete the square.