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mikevucina Group Title

how do i evaluate this expression: x(x + y) when x=-2 1/2 and y= 3 3/4?

  • 2 years ago
  • 2 years ago

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  1. bahrom7893 Group Title
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    just plug them in.

    • 2 years ago
  2. bahrom7893 Group Title
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    (-5/2)*((-5/2)+(15/4))

    • 2 years ago
  3. bahrom7893 Group Title
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    come on, you can finish the rest...

    • 2 years ago
  4. bahrom7893 Group Title
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    (-5/2)*((15/4) - (10/4))

    • 2 years ago
  5. bahrom7893 Group Title
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    (-5/2)*(5/4) = -25/8

    • 2 years ago
  6. dgo Group Title
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    mikevucina do you get how to do it?

    • 2 years ago
  7. mikevucina Group Title
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    i do know

    • 2 years ago
  8. mikevucina Group Title
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    now

    • 2 years ago
  9. dgo Group Title
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    do you know the order of operations?

    • 2 years ago
  10. mikevucina Group Title
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    ye

    • 2 years ago
  11. dgo Group Title
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    what comes first parentheses or multiplication? pop quiz lol

    • 2 years ago
  12. mikevucina Group Title
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    parentheses

    • 2 years ago
  13. dgo Group Title
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    nice

    • 2 years ago
  14. mikevucina Group Title
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    okay 3x squared when x= -1.5 is 6.25?

    • 2 years ago
  15. dgo Group Title
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    what comes first, exponents or multiplication?

    • 2 years ago
  16. mikevucina Group Title
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    exponents

    • 2 years ago
  17. dgo Group Title
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    btw im just learning this myself with you

    • 2 years ago
  18. mikevucina Group Title
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    true

    • 2 years ago
  19. dgo Group Title
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    bahrom do you square the integer first and then multiply by 3?

    • 2 years ago
  20. mikevucina Group Title
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    square number first then integer i think

    • 2 years ago
  21. dgo Group Title
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    i think you square the x (which is -1.5 and then multiply by 3

    • 2 years ago
  22. dgo Group Title
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    unless its (3x)squared

    • 2 years ago
  23. mikevucina Group Title
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    it is

    • 2 years ago
  24. dgo Group Title
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    because parentheses comes before exponents

    • 2 years ago
  25. bahrom7893 Group Title
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    sorry where?

    • 2 years ago
  26. dgo Group Title
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    3x squared when x= -1.5

    • 2 years ago
  27. bahrom7893 Group Title
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    depends on the parenthesis

    • 2 years ago
  28. mikevucina Group Title
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    question is 3x squared + 5x - 12 when x= -1.5

    • 2 years ago
  29. dgo Group Title
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    are there parentheses?

    • 2 years ago
  30. mikevucina Group Title
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    no

    • 2 years ago
  31. dgo Group Title
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    so exponents come first, -1.5^2 = what?

    • 2 years ago
  32. mikevucina Group Title
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    2.25

    • 2 years ago
  33. dgo Group Title
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    so now rewrite the equation

    • 2 years ago
  34. dgo Group Title
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    with the new piece of info

    • 2 years ago
  35. mikevucina Group Title
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    6.75 + 5x - 12

    • 2 years ago
  36. dgo Group Title
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    boom, and we can go ahead and do the 5x, its 5 * 2.25

    • 2 years ago
  37. dgo Group Title
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    oops

    • 2 years ago
  38. dgo Group Title
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    i mean 5 *x or 5* -1.5

    • 2 years ago
  39. dgo Group Title
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    can you do that and then rewrite the equation with the new info?

    • 2 years ago
  40. mikevucina Group Title
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    the answer should be 19.25 but i got 11.25?

    • 2 years ago
  41. dgo Group Title
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    hmmm, guess we need help, im asking bahrom

    • 2 years ago
  42. bahrom7893 Group Title
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    can you guys draw out the actual question?

    • 2 years ago
  43. dgo Group Title
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    question is 3x2 + 5x - 12 where x = -1.5

    • 2 years ago
  44. dgo Group Title
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    3x^2

    • 2 years ago
  45. bahrom7893 Group Title
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    3*(-1.5)^2+5*(-1.5)-12= 3*(2.25)-5*(1.5)-12

    • 2 years ago
  46. dgo Group Title
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    howd you make it -5 in the second line?

    • 2 years ago
  47. bahrom7893 Group Title
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    6.75-7.5-12= -12.5

    • 2 years ago
  48. bahrom7893 Group Title
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    5*(-1.5) that negative in front of -1.5 makes the whole thing negative

    • 2 years ago
  49. mikevucina Group Title
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    answer is supposed to be 19.25

    • 2 years ago
  50. dgo Group Title
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    ok, so that looks good. mike youre saying that the answer should be 19.25? thats weird, bahrom looks right to me, i mean it makes sense

    • 2 years ago
  51. bahrom7893 Group Title
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    |dw:1329168853490:dw|

    • 2 years ago
  52. mikevucina Group Title
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    it says that in the book

    • 2 years ago
  53. mikevucina Group Title
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    and bahroom thats the equation

    • 2 years ago
  54. bahrom7893 Group Title
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    the book's wrong

    • 2 years ago
  55. dgo Group Title
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    mike does bahrom's answer make sense to you?

    • 2 years ago
  56. mikevucina Group Title
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    ye it does

    • 2 years ago
  57. dgo Group Title
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    if so, forget the book

    • 2 years ago
  58. dgo Group Title
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    and show your teacher

    • 2 years ago
  59. dgo Group Title
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    thanks bahrom, im giving him a medal for this, for sure

    • 2 years ago
  60. bahrom7893 Group Title
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    lol finally haha medals...

    • 2 years ago
  61. dgo Group Title
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    lol win! good luck mike, cya around

    • 2 years ago
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