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I think he was talking about how you can plug in 1.59 for x in the equation x^2 + 1.80x - 5.40 and that equals zero.
A quadratic equation by definition is one which can be expressed as Ax^2+Bx+C=0. The solution to these equations are values of x which when plugged into the equation make the equation shown true, and thus equal to zero.
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