SOLUTION: 21-[-(3-4)-2]-5 21-[-3+(-4)-2]-5 21-[-7)-2]-5 21-[-7+(-2)-5 21-(-9)-5 21+9-5 30-5 25 Textbook gives this answer as 17 What am I doing wrong? Thank you.

Algebra ->  Expressions -> SOLUTION: 21-[-(3-4)-2]-5 21-[-3+(-4)-2]-5 21-[-7)-2]-5 21-[-7+(-2)-5 21-(-9)-5 21+9-5 30-5 25 Textbook gives this answer as 17 What am I doing wrong? Thank you.      Log On


   

Question 154150: 21-[-(3-4)-2]-5
21-[-3+(-4)-2]-5
21-[-7)-2]-5
21-[-7+(-2)-5
21-(-9)-5
21+9-5
30-5
25
Textbook gives this answer as 17
What am I doing wrong?
Thank you.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
21-[-(3-4)-2]-5

= 21-[(1)-2] - 5
= 21 -[-1] - 5
= 21+1 -5
= 17
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Cheers,
Stan H.