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anonymous

  • one year ago

2. Simplify the expression –4(x – 7) + 3(x + 9). Need helpe can someone help me

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  1. zzr0ck3r
    • one year ago
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    first distribute the -4 and the 3 \(a(b+c)=ab+ac\)

  2. zzr0ck3r
    • one year ago
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    then tell me what you got

  3. anonymous
    • one year ago
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    7

  4. zzr0ck3r
    • one year ago
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    ? show me how you got 7

  5. anonymous
    • one year ago
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    4+3=7

  6. zzr0ck3r
    • one year ago
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    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.

  7. anonymous
    • one year ago
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    i am confused i am not good with this stuff

  8. zzr0ck3r
    • one year ago
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    if I tell you that \(a(b+c)=ab+ac\) then \(3(x+9)=?\)

  9. anonymous
    • one year ago
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    3x+9?

  10. zzr0ck3r
    • one year ago
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    3x+3*9

  11. zzr0ck3r
    • one year ago
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    do you see how the 3 gets multiplied by the x and the 9?

  12. zzr0ck3r
    • one year ago
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    this is very important.

  13. anonymous
    • one year ago
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    yes

  14. zzr0ck3r
    • one year ago
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    ok, so we have \(-4(x-7)+3(x+9)=-4x+28+3(x+9)=\\ -4x+28+3x+27\)

  15. zzr0ck3r
    • one year ago
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    you with me

  16. zzr0ck3r
    • one year ago
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    ?

  17. anonymous
    • one year ago
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    yes

  18. zzr0ck3r
    • one year ago
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    now group the like terms \(-4x+3x+28+27\)

  19. zzr0ck3r
    • one year ago
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    can you simplify that?

  20. anonymous
    • one year ago
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    hold on

  21. anonymous
    • one year ago
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    yes

  22. zzr0ck3r
    • one year ago
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    what do you got?

  23. anonymous
    • one year ago
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    54

  24. zzr0ck3r
    • one year ago
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    what is \(-4x+3x\) ?

  25. anonymous
    • one year ago
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    -1

  26. zzr0ck3r
    • one year ago
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    the x does not go away

  27. anonymous
    • one year ago
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    well then i dont know

  28. zzr0ck3r
    • one year ago
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    Ok what about 3x+4x?

  29. zzr0ck3r
    • one year ago
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    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?

  30. anonymous
    • one year ago
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    yes

  31. zzr0ck3r
    • one year ago
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    So \(-4x+3x = -x\)

  32. zzr0ck3r
    • one year ago
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    or \(-1*x\) (same thing(

  33. anonymous
    • one year ago
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    but i need a answer

  34. zzr0ck3r
    • one year ago
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    But we just write it as \(-x\)

  35. zzr0ck3r
    • one year ago
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    ok so \(-4x+3x + 28+27 = -x+55\)

  36. anonymous
    • one year ago
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    ok

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