A positive slope is simply a slope going upward on a graph from left to right. A negative slope is a slope going downward from left to right. Often, negative slopes are the reverse of positive slopes and are both depending on the person's direction.
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The square of a real number is always positive no matter which real number you start with. Therefore, a negative number squared is positive. For example: 2 * 2 = 4, -2 * -2 = 4.
Negative and positive
There are lots of situations in the real world in which there are opposites, which can conveniently be expressed with positive/negative numbers. Here are some examples:Having money (positive), having a debt (negative)Getting a profit (positive) or a loss (negative) with a business ventureAn altitude above (positive) or below (negative) sea levelGaining points or losing points in a gameMoving in one direction or in the opposite direction. In this case, it is quite arbitrary which direction is chosen as positive.
If "a" is positive, it will have two fourth roots, one will be positive and one will be negative it will have one fifth root, which will be positive. If "a" is negative, it will have one fourth root, which will be negative. it will have one fifth root, which will be negative.