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anonymous

  • 5 years ago

5x(x^2+7x-4)

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  1. amistre64
    • 5 years ago
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    do you know what distributing is?

  2. anonymous
    • 5 years ago
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    no

  3. amistre64
    • 5 years ago
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    then lets do a simple example: we know that 3(8) = 24 right?

  4. anonymous
    • 5 years ago
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    yeaa

  5. amistre64
    • 5 years ago
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    then: 3(6+2) should equal 24 also right?

  6. anonymous
    • 5 years ago
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    yes

  7. amistre64
    • 5 years ago
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    good: what we are going to do then is "distribute" the 3 thru the (6+2) like this: 3(6) + 3(2) = 24 18 + 6 = 24 24 = 24. did you see what I did?

  8. anonymous
    • 5 years ago
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    yes i understand that but i dont understand it when it has exponets and letters

  9. amistre64
    • 5 years ago
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    fair enough..... those are simple rules as well..but lets use your problem: 5x(x^2+7x-4) 5x(x^2) + 5x(7x) + 5x(-4) 5xxx + 35xx + -20x 5x^3 + 35x^2 - 20x did you see what happened? with the x's?

  10. amistre64
    • 5 years ago
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    x^2 means you have 2 little x's x^2 = xx x^5 = xxxxx x^9 = xxxxxxxxx

  11. amistre64
    • 5 years ago
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    when we multiply "letters" we just tack on another one: xx time xxx = xxxxx x^2 times x^3 = x^5

  12. anonymous
    • 5 years ago
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    okk

  13. amistre64
    • 5 years ago
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    easy as ....pi :)

  14. anonymous
    • 5 years ago
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    can you help me with a dividing one?

  15. amistre64
    • 5 years ago
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    i can try...

  16. anonymous
    • 5 years ago
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    5x3 +10x2 +20x/5x

  17. amistre64
    • 5 years ago
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    is that 5x on the end the denominator for ALL of them? or just for the last one?

  18. anonymous
    • 5 years ago
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    for all

  19. amistre64
    • 5 years ago
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    ok.... for this we need to remember that anything over itself can be "canceled" out..... actually it turns to 1. lets do the first term: 5xxx ----- anything that is the same can be canceled 5x take off a 5x from top and bottom to get: [5x]xx xx = x^2 does that makes sense? ------ = [5x]

  20. anonymous
    • 5 years ago
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    yes

  21. amistre64
    • 5 years ago
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    2nd term: 10xx ----- what can we do to this one? 5x

  22. anonymous
    • 5 years ago
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    is it gunna be 2x?

  23. amistre64
    • 5 years ago
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    very good :)

  24. amistre64
    • 5 years ago
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    and the last one? 20x ------ 5x

  25. anonymous
    • 5 years ago
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    4x?

  26. amistre64
    • 5 years ago
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    4 is right, but we can cancel out an x from top and an x from bottom, so the answer becomes just: 4 do you see that?

  27. anonymous
    • 5 years ago
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    yea i wasnt sure but i see it now

  28. amistre64
    • 5 years ago
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    good job :) with practice youlll be better than me :)

  29. anonymous
    • 5 years ago
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    haha thank you

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