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pokemon23 Group Title

If y = 5x + 2, then find the value of 10xy + 4y in terms of y.

  • one year ago
  • one year ago

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  1. pokemon23 Group Title
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    @Hero @Calcmathlete

    • one year ago
  2. bahrom7893 Group Title
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    wow u didn't type @bah here...

    • one year ago
  3. bahrom7893 Group Title
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    I'm not smart enough????

    • one year ago
  4. bahrom7893 Group Title
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    y=5x+2 y-2 = 5x x = (1/5)(y-2)

    • one year ago
  5. bahrom7893 Group Title
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    10xy + 4y = 10 (1/5)(y-2) y + 4y = 2(y - 2)y + 4y = 2y^2 - 4y + 4y = 2y^2 <-Final answer

    • one year ago
  6. bahrom7893 Group Title
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    and it's you're

    • one year ago
  7. pokemon23 Group Title
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    o_o I'm taking the PSAT... I don't know how to do these types of questions......

    • one year ago
  8. Calcmathlete Group Title
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    To clarify on what @bahrom7893 said, I would've done something a bit simpler? \[\implies10xy + 4y~~~~~~~~~~Original~Expression\]\[\implies 2y(5x + 2)~~~~~~~~~Factor~out~the~GCF\]\[\implies 2y(y) ~~~~~~~~~~~~~~~~~~Substitute\]\[\implies 2y^2~~~~~~~~~~~~~~~~~~~~~Multiplication~of~variables\]

    • one year ago
  9. pokemon23 Group Title
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    ok let's do another problem I need to get better.

    • one year ago
  10. Calcmathlete Group Title
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    Uh ok then... \[y = (3x + 2)^3\]\[\text{Simplify in terms of y: } (9x + 6)^3\]

    • one year ago
  11. Calcmathlete Group Title
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    Very similar to the one you were doing on that PSAT question.

    • one year ago
  12. pokemon23 Group Title
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    ok I think I got it.

    • one year ago
  13. pokemon23 Group Title
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    so do I multiply to the 3rd power?

    • one year ago
  14. Calcmathlete Group Title
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    Yes, the \(^{'3'}\) implies cubing it or multiplying by itself 3 times.

    • one year ago
  15. pokemon23 Group Title
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    9x*9x*9x?

    • one year ago
  16. Calcmathlete Group Title
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    Not quite...could you show me what you did?

    • one year ago
  17. pokemon23 Group Title
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    well you its |dw:1349998059319:dw| so i multiply the exponent to the 3rd?

    • one year ago
  18. pokemon23 Group Title
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    i know its wrong..

    • one year ago
  19. Calcmathlete Group Title
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    If you were to actually multiply it out, it would be like doing this: \[(9x + 6)^3 \implies (9x + 6)(9x + 6)(9x + 6)\]which is unnecessary here. Again, like previous times, do you see anything that you can factor out?

    • one year ago
  20. pokemon23 Group Title
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    i keep forgetting to factor.....

    • one year ago
  21. pokemon23 Group Title
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    my spectacles are deceiving me

    • one year ago
  22. Calcmathlete Group Title
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    Hmm?

    • one year ago
  23. pokemon23 Group Title
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    ok if we can (9x+6) (9x+6) (9x+6)

    • one year ago
  24. pokemon23 Group Title
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    what's next?

    • one year ago
  25. Calcmathlete Group Title
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    THat is not a step that we even need to take, but we can solve it using that. It would be a slightly longer process though. Let's work WITHIN the parentheses first. Don't do anything ith the \(^3\) for now.

    • one year ago
  26. pokemon23 Group Title
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    ok will keep it (9x+6)^3

    • one year ago
  27. Calcmathlete Group Title
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    Now factor what's within the parentheses...

    • one year ago
  28. pokemon23 Group Title
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    3(3x+2)^3

    • one year ago
  29. Calcmathlete Group Title
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    The 3 wouldn't go outside of the parentheses because it's still under the \(^3\), so it would become \((3(3x + 2))^3\) Do you see why that is?

    • one year ago
  30. pokemon23 Group Title
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    explain those parentheses

    • one year ago
  31. Calcmathlete Group Title
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    Well, let's take the approach that you had before. \[(9x + 6)^3 \implies (9x + 6)(9x + 6)(9x + 6) \implies 3(3x + 2)3(3x + 2)3(3x + 2)\]\[3 \times 3 \times 3(3x + 2)(3x + 2)(3x + 2) \implies 3^3(3x + 2)^3~~~OR~~~27(3x + 2)^3\]See what I did? You can't take the 3 \(\LARGE{ENTIRELY}\) out of the parentheses unless you take the \(^3\) with it.

    • one year ago
  32. pokemon23 Group Title
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    oh

    • one year ago
  33. Calcmathlete Group Title
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    \[\LARGE{¿Entiendes?}\]

    • one year ago
  34. pokemon23 Group Title
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    si

    • one year ago
  35. Calcmathlete Group Title
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    Can you predict what to do next?

    • one year ago
  36. pokemon23 Group Title
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    distributive

    • one year ago
  37. Calcmathlete Group Title
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    What? Keep in mind the original question and what y is equal to...

    • one year ago
  38. pokemon23 Group Title
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    then we should substitute

    • one year ago
  39. Calcmathlete Group Title
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    \[\huge\color{red}{Y}\color{blue}{E}\color{salmon}{S}\color{green}{!}\]

    • one year ago
  40. pokemon23 Group Title
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    so ....

    • one year ago
  41. pokemon23 Group Title
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    instead of the x make it a y?

    • one year ago
  42. Calcmathlete Group Title
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    Uh...remember that \(y = (3x + 2)^3...\) You can substitute y in for that value now. Tell me what your final answer would be now.

    • one year ago
  43. pokemon23 Group Title
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    jinkies

    • one year ago
  44. pokemon23 Group Title
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    hmm ummm

    • one year ago
  45. pokemon23 Group Title
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    y=27x^3+8

    • one year ago
  46. Calcmathlete Group Title
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    Umm...no... \[(9x + 6)^3 \implies (3(3x + 2))^3 \implies 3^3(3x + 2)^3 \implies 27(3x + 2)^3 \implies 27y\]

    • one year ago
  47. Calcmathlete Group Title
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    Do you see why? Do you understand what it means when it says "in terms of y"? Do you see that we're replacing ALL OF \((3x + 2)^3\) with y? That way nothing in that is cubed anymore?

    • one year ago
  48. pokemon23 Group Title
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    I still don't get how divided 27(3x+2)^3 to get 27y

    • one year ago
  49. Calcmathlete Group Title
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    Where do you see a division symbol? There is no division invloved in this except the beginning factoring portion. \[\large{\text{We just clarified that y}}~\LARGE\text{=}~\large{(3x + 2)^3}\]Just replace \((3x + 2)^3\) with y and that's all that happened.

    • one year ago
  50. pokemon23 Group Title
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    where does (3x+2)^3? disappear?

    • one year ago
  51. pokemon23 Group Title
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    I don't understand the y part...

    • one year ago
  52. Calcmathlete Group Title
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    fdiofvejbvnweokgnweoifnerwo That is what we're substituting with y! Remember when we said y = 2 and we plugged it in? Well we could say that 2 = y and we plug y in for the 2. SAME THING HERE. y = (3x + 2)^3 (3x + 2)^3 = y Now you just plug in why for the (3x + 2)^3

    • one year ago
  53. Calcmathlete Group Title
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    You still there?

    • one year ago
  54. pokemon23 Group Title
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    im here

    • one year ago
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