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Umm I don't believe the equation on the first site is quadratic even though it looks like it unless its a typo. You use ^ symbol to show that something is being raised to a power not parenthesis. Parenthesis just mean in math that you multiply ax and two together. Of course It could be a typo or a trick.
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If either a public officer or any one else saw a person attempting to cross a bridge which had been ascertained to be unsafe, and there were no time to warn him of his danger, they might seize him and turn him back without any real infringement of his liberty; for liberty consists in doing what one desires, and he does not desire to fall into the river. -Mill
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