What is -2-8?

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valentin68's profile pic

valentin68 | College Teacher | (Level 3) Associate Educator

Posted on

When we have one negative number substracted from another negative number we can use the fact that the a minus sign can be factorized outside a paranthesis containing the two numbers. Thus inside the paranthesis will remain only two positive numbers that simply add toghether. This way the positive integer numbers are increasing to the right of the real axis, while the negative numbers are increasing in absolute value to the left of real axis.

`-2-8 =-(2+8) =-(10) =-10`

malkaam's profile pic

malkaam | Student, Undergraduate | (Level 1) Valedictorian

Posted on

- 2 - 8

The answer to this is -10. 

Here are a few pointers that should be kept in mind,

  • when there are 2 different signs then they are subtracted, and then sign of the bigger number is taken.
  • when there are 2 same signs then they are added, and then sign of the bigger number is taken.
  • In multiplication or division 2 different signs will result in a negative sign and 2 same signs will result in a positive sign.

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