My Math Forum Can someone explain this to me please?

 Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion

 September 22nd, 2015, 10:34 AM #1 Newbie   Joined: Sep 2015 From: Somewhere Posts: 17 Thanks: 0 Can someone explain this to me please? http://s16.postimg.org/ds5koq7c5/asdasdsaadas.png Why is the product a negative? Isn't both negative leads to positive? I have a problem also that the product became negative what does it mean? Plzzz explain
 September 22nd, 2015, 10:38 AM #2 Math Team     Joined: Jul 2011 From: Texas Posts: 3,034 Thanks: 1621 It's not a product ... it's subtraction.
 September 22nd, 2015, 11:49 AM #3 Senior Member     Joined: Apr 2014 From: Europa Posts: 584 Thanks: 177 $\displaystyle -\dfrac{7}{8}-\left(-\dfrac{5}{6} \right)= -\dfrac{7}{8} + \dfrac{5}{6} = \dfrac{5}{6}-\dfrac{7}{8}$ Thanks from sadmath
September 22nd, 2015, 11:04 PM   #4
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Quote:
 Originally Posted by aurel5 $\displaystyle -\dfrac{7}{8}-\left(-\dfrac{5}{6} \right)= -\dfrac{7}{8} + \dfrac{5}{6} = \dfrac{5}{6}-\dfrac{7}{8}$
I get that but I encountered a same problem but different numbers but the answer is positive how's that?

September 22nd, 2015, 11:05 PM   #5
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Quote:
 Originally Posted by skeeter It's not a product ... it's subtraction.
ok what should I call it then?

 September 22nd, 2015, 11:34 PM #6 Global Moderator   Joined: Dec 2006 Posts: 21,029 Thanks: 2259 Call what? Note that $-(-\frac56) = (-1)(-\frac56) = \frac56$, so the two negatives have produced a positive. The final answer is negative because 7/8 is greater than 5/6. Thanks from sadmath
September 22nd, 2015, 11:40 PM   #7
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Quote:
 Originally Posted by skipjack Call what? Note that $-(-\frac56) = (-1)(-\frac56) = \frac56$, so the two negatives have produced a positive. The final answer is negative because 7/8 is greater than 5/6.
Oh! Thank you!

Last edited by skipjack; September 22nd, 2015 at 11:47 PM.

 September 23rd, 2015, 11:55 AM #8 Newbie   Joined: Sep 2015 From: Somewhere Posts: 17 Thanks: 0 I don't really get it is that some kind of rule? i always get the right answer but not the negative sign or positive sign one (( ( Last edited by sadmath; September 23rd, 2015 at 11:59 AM.
 September 23rd, 2015, 12:19 PM #9 Math Team     Joined: Jul 2011 From: Texas Posts: 3,034 Thanks: 1621 $-\dfrac{7}{8} + \dfrac{5}{6}$ First, get a common denominator ... $-\dfrac{21}{24}+\dfrac{20}{24} = -\dfrac{1}{24}$ ... when combining two values with opposite signs, subtract and keep the sign of the greater value. Thanks from sadmath
September 23rd, 2015, 11:22 PM   #10
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Quote:
 Originally Posted by skeeter $-\dfrac{7}{8} + \dfrac{5}{6}$ First, get a common denominator ... $-\dfrac{21}{24}+\dfrac{20}{24} = -\dfrac{1}{24}$ ... when combining two values with opposite signs, subtract and keep the sign of the greater value.

Ok now I get it it is negative because the positive one is smaller than the negative right? that's the kind of explanation im finding thank you now my classmates wont tease me anymore

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