anonymous
  • anonymous
2. Simplify the expression –4(x – 7) + 3(x + 9). Need helpe can someone help me
Mathematics
jamiebookeater
  • jamiebookeater
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zzr0ck3r
  • zzr0ck3r
first distribute the -4 and the 3 \(a(b+c)=ab+ac\)
zzr0ck3r
  • zzr0ck3r
then tell me what you got
anonymous
  • anonymous
7

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zzr0ck3r
  • zzr0ck3r
? show me how you got 7
anonymous
  • anonymous
4+3=7
zzr0ck3r
  • zzr0ck3r
I said to distribute, not add them together... \(-4(x-7)+3(x+9)=-4x+28+3(x+9)\) I distributed the -4, now do something similar with \(3(x+9)\) and show me what you got.
anonymous
  • anonymous
i am confused i am not good with this stuff
zzr0ck3r
  • zzr0ck3r
if I tell you that \(a(b+c)=ab+ac\) then \(3(x+9)=?\)
anonymous
  • anonymous
3x+9?
zzr0ck3r
  • zzr0ck3r
3x+3*9
zzr0ck3r
  • zzr0ck3r
do you see how the 3 gets multiplied by the x and the 9?
zzr0ck3r
  • zzr0ck3r
this is very important.
anonymous
  • anonymous
yes
zzr0ck3r
  • zzr0ck3r
ok, so we have \(-4(x-7)+3(x+9)=-4x+28+3(x+9)=\\ -4x+28+3x+27\)
zzr0ck3r
  • zzr0ck3r
you with me
zzr0ck3r
  • zzr0ck3r
?
anonymous
  • anonymous
yes
zzr0ck3r
  • zzr0ck3r
now group the like terms \(-4x+3x+28+27\)
zzr0ck3r
  • zzr0ck3r
can you simplify that?
anonymous
  • anonymous
hold on
anonymous
  • anonymous
yes
zzr0ck3r
  • zzr0ck3r
what do you got?
anonymous
  • anonymous
54
zzr0ck3r
  • zzr0ck3r
what is \(-4x+3x\) ?
anonymous
  • anonymous
-1
zzr0ck3r
  • zzr0ck3r
the x does not go away
anonymous
  • anonymous
well then i dont know
zzr0ck3r
  • zzr0ck3r
Ok what about 3x+4x?
zzr0ck3r
  • zzr0ck3r
if you have 3 of something and you add 4 more, then you have 7 of that something the something here is x, so 3x+4x=7x make sense?
anonymous
  • anonymous
yes
zzr0ck3r
  • zzr0ck3r
So \(-4x+3x = -x\)
zzr0ck3r
  • zzr0ck3r
or \(-1*x\) (same thing(
anonymous
  • anonymous
but i need a answer
zzr0ck3r
  • zzr0ck3r
But we just write it as \(-x\)
zzr0ck3r
  • zzr0ck3r
ok so \(-4x+3x + 28+27 = -x+55\)
anonymous
  • anonymous
ok

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