Question

Perform the indicated operation. (-20) - (-10)

Answer 1

Result -10

Explanation:

We need to calcualte the result (R) of (-20)-(-10).

Firstly, we need to introduce the law of signs: the product or the quotient of two numbers of like the sign is positive. The product or the quotient of two numbers of unlike sign is negative. It means

++ = +

+- = -

-+ = -

--=+

Now we can apply this math law to the expression:

R =(-20) - (-10)

R=(-20) - - 10

As -- = + taking into account the law of signs

R = -20 + 10 = -10

Finally, the result of this expression is -10.

Answer 2

-10

Explanation:

- - is +, so the operation is -20 + 10, which is -10