anonymous
  • anonymous
Can someone help me solve this expression: 15-20×-5+–1=
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
Hey again :D one sec.
ccswims
  • ccswims
remember PEMDAS
anonymous
  • anonymous
Uh -9-20x, but if you are distributing then -9=20x = -2.222222222

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ccswims
  • ccswims
OH WAIT. lol i thought that "x" was a multiply symbol XD
mathstudent55
  • mathstudent55
Is this the expression? \(\Large 15 - 20 \times (-5) + (–1) = \)
anonymous
  • anonymous
Yeah
anonymous
  • anonymous
here is the math :P 15-20x-5+-1 15-5+-1=-9 -9-20x= +20x to both sides = -9=20x simple division leads us to -2.222222
anonymous
  • anonymous
Wait no there aren't any parenthesis
mathstudent55
  • mathstudent55
You must follow the correct order of operations. Multiplications and divisions come before additions and subtractions.
anonymous
  • anonymous
simple isolation of the variable right ?
anonymous
  • anonymous
Yeah @Etrainx
calculusxy
  • calculusxy
\[15 - 20 \times (-5) + (-1)\] \[15 + 100 + (-1)\] \[115 + (-1)\] \[114\]
anonymous
  • anonymous
Should I multiply -20×-5 since its multiplication & following the order of pemdas ?
anonymous
  • anonymous
OH i see
anonymous
  • anonymous
you have 20 * (-5)
anonymous
  • anonymous
i have 20x
anonymous
  • anonymous
But the 20 is negative
calculusxy
  • calculusxy
The x really means multiplying. You're not working with variables, I believe.
calculusxy
  • calculusxy
@Halia You're correct. It's -20 because of the minus sign.
anonymous
  • anonymous
when you subtract a negative number it becomes positive though.
anonymous
  • anonymous
Yeah @calculusxy
calculusxy
  • calculusxy
@Etrainx You need to work with PEMDAS and this states that multiplying is before subtracting. Thus, you need to do -20 times -5.
anonymous
  • anonymous
Wait so I multiped -20×-5 and I got +100
anonymous
  • anonymous
I think these mathletes have it from here :P
calculusxy
  • calculusxy
Yes that's correct .
mathstudent55
  • mathstudent55
That means you must start with \(20 \times (-5)\) \(\Large 15 - \color{red}{20 \times (-5)} + (–1) =\) \(\Large = 15 - \color{red}{(-100)} + (–1) \) Now we only have additions an subtractions, so we do them in the order they appear from left to right: \(\Large =15 - (-100) + (–1) \) \(\Large =15 + 100 -1 \) \(\Large =115 - 1\) \(\Large =114\)
calculusxy
  • calculusxy
The work that I did but explained in a better way @mathstudent55
calculusxy
  • calculusxy
;)
calculusxy
  • calculusxy
It's confusing, but just remember to take into consideration the sign (plus or minus) because that determines whether the following integer will be negative or positive.
anonymous
  • anonymous
Mkay I understand it now :) thanks guys I really appreciate it !!!
calculusxy
  • calculusxy
You're very welcome @Halia :)
mathstudent55
  • mathstudent55
Order of operations PEMDAS P - first do what is inside parentheses E - then do exponents MD - then do multiplications and divisions from left to right in the order they appear AS - finally do additions and subtractions in the order they appear from left to right
mathstudent55
  • mathstudent55
You're welcome.

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