anonymous
  • anonymous
I got this question wrong on my College Algebra test and i don't know why it is wrong. please help.
Algebra
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
Write in interval notation... \[-7 \le x < 9\] and i put \[[-7, \infty) (-\infty, 9)\] How is this wrong?
anonymous
  • anonymous
@hartnn can you help explain this please
kropot72
  • kropot72
Put into words, the expression says: x is equal to or greater than negative 7, and x is less than 9.

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jackthegreatest
  • jackthegreatest
first of all, x does not go on to infinite
jackthegreatest
  • jackthegreatest
i just had this lesson in math
hartnn
  • hartnn
which also means x is between -7 and 9 (-7 included) what you answered meant: x is greater than -7 till infinity, and x is less than 9 till -infinity
kropot72
  • kropot72
You can find how to express this here: http://www.mathwords.com/i/interval_notation.htm
jackthegreatest
  • jackthegreatest
the answer should be [-7,9) i am almost certain
hartnn
  • hartnn
|dw:1442686985618:dw|
jackthegreatest
  • jackthegreatest
@hartnn is right
kropot72
  • kropot72
[-7, 9)
hartnn
  • hartnn
|dw:1442687043917:dw|
anonymous
  • anonymous
I don't need graphs.
hartnn
  • hartnn
ok, what doubt you still have? :)
anonymous
  • anonymous
interval notation is like a basket, lets say of a row of kittens: kitten a, b, c, d, e. [b, d] means basket contains b and d: {b, c, d} (a, e) means the basket does not include a and e: a {b, c, d} e what you wrote was two baskets. one that contains {-7 and everything above in the world} and one that contains {everything below in the world up to but not including 9} 9 is out here. You need an additional relationship between the two to say what if you mean "AND" or "OR".. (another way of saying it is, only the overlap of the two baskets, known as INTERSECTION of the two... or anything in both baskets, you dont care, known as the UNION of the two.) Since you didn't indicate a relation, you pretty much said two baskets that contain everything in the world. :) the correct basket is [-7, 9).. only the stuff in between -7 and 9, INCLUDING -7 but NOT including 9. Technically the same meaning but you haven't learned it yet, is the INTERSECTION of the two baskets you wrote: The basket containing only the overlap or what's in both baskets. Which simplifies to [-7, 9)
anonymous
  • anonymous
sorry UNION is anything in in EITHER basket is more correct wording. :)

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