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Here is a quadratic equation along with its solution. There's only 1 thing I don't understand. In the brackets how do we know that the values are - 4 and - 5 as opposed to + 4 and + 5. Why are they both negative when the quadratic contains both a negative and a positive expression?
x^{2} - 9 + 20 = 0
(x - 4) (x - 5) = 0
x = 4 or 5
x^{2} - 9 + 20 = 0
(x - 4) (x - 5) = 0
x = 4 or 5