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mikevucina

  • 3 years ago

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

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  1. bahrom7893
    • 3 years ago
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    just plug them in.

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

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

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

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

  6. dgo
    • 3 years ago
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    mikevucina do you get how to do it?

  7. mikevucina
    • 3 years ago
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    i do know

  8. mikevucina
    • 3 years ago
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    now

  9. dgo
    • 3 years ago
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    do you know the order of operations?

  10. mikevucina
    • 3 years ago
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    ye

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

  12. mikevucina
    • 3 years ago
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    parentheses

  13. dgo
    • 3 years ago
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    nice

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

  15. dgo
    • 3 years ago
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    what comes first, exponents or multiplication?

  16. mikevucina
    • 3 years ago
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    exponents

  17. dgo
    • 3 years ago
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    btw im just learning this myself with you

  18. mikevucina
    • 3 years ago
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    true

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

  20. mikevucina
    • 3 years ago
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    square number first then integer i think

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

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

  23. mikevucina
    • 3 years ago
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    it is

  24. dgo
    • 3 years ago
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    because parentheses comes before exponents

  25. bahrom7893
    • 3 years ago
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    sorry where?

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

  27. bahrom7893
    • 3 years ago
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    depends on the parenthesis

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

  29. dgo
    • 3 years ago
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    are there parentheses?

  30. mikevucina
    • 3 years ago
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    no

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

  32. mikevucina
    • 3 years ago
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    2.25

  33. dgo
    • 3 years ago
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    so now rewrite the equation

  34. dgo
    • 3 years ago
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    with the new piece of info

  35. mikevucina
    • 3 years ago
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    6.75 + 5x - 12

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

  37. dgo
    • 3 years ago
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    oops

  38. dgo
    • 3 years ago
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    i mean 5 *x or 5* -1.5

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

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

  41. dgo
    • 3 years ago
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    hmmm, guess we need help, im asking bahrom

  42. bahrom7893
    • 3 years ago
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    can you guys draw out the actual question?

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

  44. dgo
    • 3 years ago
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    3x^2

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

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

  47. bahrom7893
    • 3 years ago
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    6.75-7.5-12= -12.5

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

  49. mikevucina
    • 3 years ago
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    answer is supposed to be 19.25

  50. dgo
    • 3 years ago
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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

  51. bahrom7893
    • 3 years ago
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    |dw:1329168853490:dw|

  52. mikevucina
    • 3 years ago
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    it says that in the book

  53. mikevucina
    • 3 years ago
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    and bahroom thats the equation

  54. bahrom7893
    • 3 years ago
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    the book's wrong

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

  56. mikevucina
    • 3 years ago
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    ye it does

  57. dgo
    • 3 years ago
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    if so, forget the book

  58. dgo
    • 3 years ago
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    and show your teacher

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

  60. bahrom7893
    • 3 years ago
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    lol finally haha medals...

  61. dgo
    • 3 years ago
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    lol win! good luck mike, cya around

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