SOLUTION: We have a pre algebra problem we are trying to understand. it goes as -2(5-6)+10 (6-7)- 25 divided by 5= the book states the answer is -13 while we end up with -7. How is the a

Question 1048841: We have a pre algebra problem we are trying to understand.
it goes as -2(5-6)+10 (6-7)- 25 divided by 5= the book states the
answer is -13 while we end up with -7. How is the answer -13.
Found 2 solutions by josgarithmetic, rothauserc:
Answer by josgarithmetic(39627) (Show Source): You can put this solution on YOUR website!
Pay careful attention to Order Of Operations and signs.

PARENTHESES first
-2(-1)+10(-1)-25/5
the forward slash standing for "division"

MULTIPLICATIONS AND DIVISIONS, next strictly from left to right
2+(-10)-5
which really is same as 2+(-10)+(-5), but the distinction should not be a problem here.

ADDITIONS AND SUBTRACTIONS from left to right as found
2+(-10)-5
-8-5
-13

-
Order of Operations is Parentheses, Exponents, Multiplication, Division, Addition, Subtraction
Abbreviated acronym, PEMDAS
Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
(-2(5-6)+10 (6-7))- (25 / 5)
:
order of operations, do all multiplication and division in the order they appear
:
from left to right, then do addition and subtraction in the order they appear from left to right, do operations in parenthesis first
:
(-2(-1) + 10(-1)) -5
:
(2 - 10) - 5
:
***********
-8 -5 = -13
***********
:

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