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The negative solutions are often discard because they have no real meaning in the real world, for example, you can not have -6 apples, it just doesn't make sense.
its because astronomers basis of brightness is the sun...
When determining temperature in the negative range, which is more often seen in the Celsius scale versus the Fahrenheit scale. Negative numbers in Celsius are below the freezing point of water.Reported changes in tides and barometric levels use negative numbers as well, although the readings themselves would not be negative.
A number line can have both positive and negative numbers. You can put the number line in any position, but often it is represented so that numbers to the right of zero are positive, and numbers to the left of zero, negative.
Two numbers are negative reciprocals if their product is -1. The numbers 1/2 and -2 are negative reciprocals. Their product is -1. This is often seen in problems involving the slopes of two lines. The slopes of perpendicular lines are negative reciprocals. Their product is -1.