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christinewilliams

Solve 8x2 + 7x - 15 = - 7. Enter your answers as decimals rounded to two places. in order from least to greatest.

  • one year ago
  • one year ago

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  1. Emily778
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    an*

    • one year ago
  2. christinewilliams
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    i got it straight from my homework i just looked again it is the same

    • one year ago
  3. sanchez9457
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    Is that 8 times 2?

    • one year ago
  4. christinewilliams
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    yes

    • one year ago
  5. christinewilliams
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    i think it is 7x minus 15

    • one year ago
  6. christinewilliams
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    i think it is 8 times 2 plus 7x minus 15 = negative 7.

    • one year ago
  7. sanchez9457
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    Multiply out 8 * 2 and add it to -15

    • one year ago
  8. sanchez9457
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    then subtraact that new value to the -7 and divide by 7 and that should give you your x.

    • one year ago
  9. christinewilliams
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    wait so 8*2 is 16 then adding it to -15 would be 1 right then you subtract that from -7 would be 8 and dividing it would 1.14 right? it says i have to have two decimals though so what do i do after that?

    • one year ago
  10. sanchez9457
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    it would be -8 not 8. so it should give you -1.14 if you did your calculuations correctly. 1.14 is two decimal places. you have the tenths and the hundredths places.

    • one year ago
  11. christinewilliams
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    no like 1.14 as one answer than there should be another answer for it

    • one year ago
  12. Algebraic!
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    I think this is supposed to be a quadratic and you're going to want to use the quadratic formula...

    • one year ago
  13. Algebraic!
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    first write it in the form ax^2 +bx +c =0 then plug the values of a b and c into the quad. formula

    • one year ago
  14. sanchez9457
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    I don't quite understand this then. So that is not a multiplication like you said it's 8x?

    • one year ago
  15. christinewilliams
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    it is from the lessons linear and quadratic functions

    • one year ago
  16. sanchez9457
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    Oh so then that is not 8 times 2 , it's 8x^2

    • one year ago
  17. christinewilliams
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    im so confused guys

    • one year ago
  18. sanchez9457
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    Forgetting that little carrot is a huge thing.

    • one year ago
  19. christinewilliams
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    it didnt have the carrot thingy

    • one year ago
  20. Algebraic!
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    re-write it in the form ax^2 +bx +c =0 plug the values of a b and c into the quad. formula

    • one year ago
  21. christinewilliams
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    where do i find the a b c thing

    • one year ago
  22. Algebraic!
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    a=8 b =7 c=...?

    • one year ago
  23. Algebraic!
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    or are you talking about the quadratic formula?

    • one year ago
  24. christinewilliams
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    i have no clue honestly i am so confused right now

    • one year ago
  25. sanchez9457
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    @Algebraic! : i'm not sure it's a quadratic equation sine he just said there was nothing squared. so the qudratic formula would render usless he made a mistake in copying the problem.

    • one year ago
  26. Algebraic!
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    it's in your book or everywhere on the internet

    • one year ago
  27. christinewilliams
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    im a girl first and second the problem is right in front of me it is right. and it is on my homework online

    • one year ago
  28. christinewilliams
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    i got it guys thanks

    • one year ago
  29. sanchez9457
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    Sorry about that!

    • one year ago
  30. christinewilliams
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    no its fine thank you for trying

    • one year ago
  31. Algebraic!
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    "im a girl first " so?

    • one year ago
  32. christinewilliams
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    he kept calling me a dude

    • one year ago
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