adding and subtracting integers

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afnanmoh: Newbie | Next Rank: 10 Posts; Posts: 9; Joined: Fri Jan 06, 2012 1:20 am

by afnanmoh » Thu Feb 23, 2012 4:26 am

hello,
i wanna know when should i have the result with (-) or (+)
im confused!!
For example,
-6 * -7 + -12 + 3

like this problem, i don't know how can i solve it since there are minus and plus at the same time...

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Source: Beat The GMAT — Problem Solving | Thu Feb 23, 2012 4:26 am

sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Thu Feb 23, 2012 5:19 am

afnanmoh wrote:hello,
i wanna know when should i have the result with (-) or (+)
im confused!!
For example,
-6 * -7 + -12 + 3

like this problem, i don't know how can i solve it since there are minus and plus at the same time...

Ideally, such expressions are not given without brackets.

Consider writing like this: (-6) * (-7) + (-12) + 3.

Whenever a (-) counters a (+) or vice versa, the operating sign is (-) in either case, also revise BODMAS/PEMDAS to handle more complicated cases than this one.

(-6) * (-7) + (-12) + 3 = 42 - 12 + 3 = 33.

The mind is everything. What you think you become. -Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com

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