A negative number divided by a negative number always yields a positive number. For instance, -4 / -2 = 2. In other words, there are two -2s in -4.
Know MoreLikewise, two negative numbers multiplied together always yield a positive number. For example, -2 x -2 = 4. Two positive numbers multiplied together are also positive, as is a positive number divided by a positive number.
A positive number multiplied by a negative number is always negative. For instance, -2 x 2 = -4. Negative numbers divided by positive numbers and positive numbers divided by negative numbers are always negative. For example, -4 / 2 = -2, and 4 / -2 = -2.
Learn more about AlgebraA negative minus a negative is equal to another negative number, a positive number or zero, depending upon the numbers in the equation. Subtracting a negative number from another negative number is the same thing as adding a positive number.
Full Answer >Multiplying or dividing both sides of an equation by a negative number changes the inequality of the equation, because it changes the sign of each side of the equation. On both sides, what was positive becomes negative, and what was negative becomes positive.
Full Answer >The fourth root of 16 is 2. In mathematics, the fourth root of a number is a number r that yields z when raised to power 4, where 4 is the degree of the root.
Full Answer >The fact that a negative times a negative equals a positive can be proven mathematically using algebraic manipulation. Specifically, it can be proven using the equation x = (a)(b) + (-a)(b) + (-a)(-b), where a and b are any positive numbers and x is unknown, via factoring and reducing the expression.
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