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Because they are basis to Algebra. And Algebra is one of the fundamentals of Mathematic.

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Q: Why are positive and negative signs needed?
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Related questions

When multiplying numbers what do you do with the positive and negative signs?

Negative * positive = negative Positive * positive = positive Negative * negative = positive


When dividing a positive number by a positive number the quotient is?

The answer is always positive. If the signs are the same (positive by positive, negative by negative), then the quotient is always positive. If the signs are different (positive by negative, negative by positive), then the quotient is always negative.


What does a and a and equall?

a(-)and a(-)=positive a(+)and a(+)=positive but a(-)and a(+) or a(+)and a(-)= negative so two signs the same is positive and two signs that are different are negative.


How do you multiply integers having unlike sign?

Positive x Positive = Positive Negative x Negative = Positive Positive x Negative = Negative Basically if the signs are the same, the answer will always be positive, and if the signs are different the answer will be negative. Hope this helps.


How do i divide integers with different signs?

see if have -8 divided by -8 divide the number number first and then see to the following signs-8 divided by -8 is equal to +1-8 divided by +8 is equal to -1so different signs -same sign +++=+--=++-=--+=-


Is the sum of two integers with the same sign positive or negative?

if the 2 signs are negative, than the sum is negative. if the 2 signs are positive, than the sum is positive.


Is a negative subtract a negative a positive?

Yes. A negative subtracted by a negative is a positive. Just remember that two like signs become a positive sign, and two unlike signs become a negative sign.


What signs are used when mulitiplying and dIviding integers would the signs be the same and the answer negative?

positive x positive = positive negative x negative = positive positive x negative = negative negative x positive = negative The same rules apply for dividing, since dividing is actually multiplying by the reciprical.


What are the negative factors of a positive number?

The same as the positive ones with negative signs.


Rule for multiplying integers?

Positive x negative = negative (Negative x positive = negative) Positive x positive = positive Negative x negative = positive So if the signs are the same the answer is positive and if they are different it is negative.


What is the rule for dividing integers?

When dividing numbers that are different the answer will be negative.


Does a negative multiplied by a negative equal a positive?

Yes. Same for positive times a positive (Obviously). If the signs are the same, it is positive. So, a positive times a negative is negative.