anonymous
  • anonymous
please help! Evaluate the following expression using the values given: Find 4x − y − 2z if x = −2, y = 3, and z = −2 −15< I thought it was this, but its not... 15 −7 7
Mathematics
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SOLVED
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schrodinger
  • schrodinger
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MichaelAlex292
  • MichaelAlex292
Input the values in the equation:\[4(-2) - (3) - 2(-2)\] And then solve
anonymous
  • anonymous
I did.. I solved it, and I thought I solved it correctly... I even wrote the problem like that!
MichaelAlex292
  • MichaelAlex292
Hmmm, let's see:\[(-8 ) - 3 = -11\] \[-11 + 4 = -7\] Remember that -2 times -2 is +4, so -7 is the answer

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anonymous
  • anonymous
oh thanks!
MichaelAlex292
  • MichaelAlex292
No problem
anonymous
  • anonymous
can you help with another one?
MichaelAlex292
  • MichaelAlex292
Ok, but let me see it first
MichaelAlex292
  • MichaelAlex292
What class are you taking btw?
anonymous
  • anonymous
Evaluate the following: −3 − (−8). 5 −5 −11< wouldnt it be this? −18
anonymous
  • anonymous
algebra 1
MichaelAlex292
  • MichaelAlex292
Oh ok, so for this equation, this is what it looks like:\[-3 + -1(-8)\] When you have a negative sign right before the parentheses, it can be shown like above. Now can you solve it?
anonymous
  • anonymous
Think of it like this \[\large (-3)+(-1(-1 \times 8)\] The two -1's cancel out leaving you with \[\large -3+8\]
MichaelAlex292
  • MichaelAlex292
Yep, he's right
anonymous
  • anonymous
so 5?
MichaelAlex292
  • MichaelAlex292
Yes

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