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Quadratic equation, cause it's the only formula that I can say off the top of my head without thinking for a second, I even have to think to remember the formula for the area of a rectangle.
-b(plus/minus) (the square root of(b^2 -4ac))/2a
Used to find the roots of a formula in the form of:
ax^2 + bx + c
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Apathy: The best outlook this side of I don't give a damn.
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