How do you evaluate #82+ ( - 57)#?

1 Answer
Tony B
Dec 20, 2016

#82-57#

Explanation:

Think of this as #82+1(-57)#

Multiply everything inside the brackets by #+1#
When you multiply or divide, if the signs are different then the answer is negative. On the other hand, if both signs are the same then the answer is positive.

#(+1)xx(-57) =-57" "larr" the signs are different"#

giving:

#82-57#

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