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September 22nd, 2015, 10:34 AM   #1
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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
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September 22nd, 2015, 10:38 AM   #2
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It's not a product ... it's subtraction.
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September 22nd, 2015, 11:49 AM   #3
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$\displaystyle -\dfrac{7}{8}-\left(-\dfrac{5}{6} \right)= -\dfrac{7}{8} + \dfrac{5}{6} = \dfrac{5}{6}-\dfrac{7}{8}$
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September 22nd, 2015, 11:04 PM   #4
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Quote:
Originally Posted by aurel5 View Post
$\displaystyle -\dfrac{7}{8}-\left(-\dfrac{5}{6} \right)= -\dfrac{7}{8} + \dfrac{5}{6} = \dfrac{5}{6}-\dfrac{7}{8}$
I get that but I encountered a same problem but different numbers but the answer is positive how's that?
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September 22nd, 2015, 11:05 PM   #5
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Quote:
Originally Posted by skeeter View Post
It's not a product ... it's subtraction.
ok what should I call it then?
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September 22nd, 2015, 11:34 PM   #6
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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.
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September 22nd, 2015, 11:40 PM   #7
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Quote:
Originally Posted by skipjack View Post
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.
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September 23rd, 2015, 11:55 AM   #8
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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.
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September 23rd, 2015, 12:19 PM   #9
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$-\dfrac{7}{8} + \dfrac{5}{6}$

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.
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September 23rd, 2015, 11:22 PM   #10
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Quote:
Originally Posted by skeeter View Post
$-\dfrac{7}{8} + \dfrac{5}{6}$

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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