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Makayla43

Solve by factoring. 4x2 + 23x + 15 = 0

  • one year ago
  • one year ago

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  1. timo86m
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    ooh i like these

    • one year ago
  2. freckles
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    \[ax^2+bx+c=0\] So what you want to do is find factors of a*c that have product a*c and sum b.

    • one year ago
  3. timo86m
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    (x+5)*(4*x+3)

    • one year ago
  4. Makayla43
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    Good! Can you help me?

    • one year ago
  5. freckles
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    find two factors*

    • one year ago
  6. freckles
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    So what is a here? And what is b here? And what is c here?

    • one year ago
  7. Makayla43
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    \[4x ^{2}+23x+15=0\]

    • one year ago
  8. timo86m
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    (x+5)*(4*x+3) x= -5 and -3/4 right

    • one year ago
  9. freckles
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    @timo86m I don't think it helps to give the answer. Can you explain how you got those factors?

    • one year ago
  10. Makayla43
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    A:x = 0.8 or x = -0.75 C:x = 0.75 or x = 5 B:x = -3 or x = -1.25 D:x = -0.75 or x = -5

    • one year ago
  11. freckles
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    @Makayla43 if you want to learn this, I'm trying to teach you.

    • one year ago
  12. freckles
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    What is a,b, and c in your equation?

    • one year ago
  13. Makayla43
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    @KNicksfan4life :D (:

    • one year ago
  14. KNicksfan4life
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    (4x-3)(x-5)

    • one year ago
  15. Makayla43
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    @freckles what do you mean a,b,and c?

    • one year ago
  16. KNicksfan4life
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    is that rite

    • one year ago
  17. timo86m
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    it not right

    • one year ago
  18. freckles
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    \[ax^2+bx+c=0\] \[4x^2+23x+15=0\]

    • one year ago
  19. timo86m
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    (x+5)*(4*x+3) if you not sure you can always expand this

    • one year ago
  20. Makayla43
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    Solve by factoring. -3x2 - x + 2 = 0

    • one year ago
  21. timo86m
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    -(x+1)*(3*x-2)

    • one year ago
  22. Makayla43
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    \[-3x ^{2}-x+2=0\]

    • one year ago
  23. timo86m
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    -3x2 - x + 2 = 0 you actually mean -3x^2 - x + 2 = 0

    • one year ago
  24. Makayla43
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    A:x = 0.5 or x = 0.33333 C:x = 1 or x = -0.66667 B:x = 0.33333 or x = -2 D:x = -1 or x = 0.66667

    • one year ago
  25. timo86m
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    I think it d

    • one year ago
  26. myininaya
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    You guys how is this teaching and how is this learning? Please try to teach @Makayla43 and not just give the answer. And @Makayla43 you shouldn't be just looking for answers. I think freckles here was trying to teach you how to do this.

    • one year ago
  27. Makayla43
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    Omg.

    • one year ago
  28. timo86m
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    i teached, I said expand my factor if she doubts it lol.

    • one year ago
  29. myininaya
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    But @timo86m how do you get the factors? Please explain that part so she will know how to do it.

    • one year ago
  30. Makayla43
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    Goodbye. He sent me a message a explained.

    • one year ago
  31. timo86m
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    4x2 + 23x + 15 = 0 number that up to 15 and product is 23

    • one year ago
  32. timo86m
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    To factor is mostly guess work that is where I draw the line :)

    • one year ago
  33. timo86m
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    number that up to c and product is b coefficient. It is more important to show why it works then how to do something that is mostly guess work.

    • one year ago
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