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x is an integer

list all the values of x such that-1<2x<8
the <8 has a line under it btw
how do you work this out? i know how to do it for just x by itself but not 2x
Oh look, it's the troll again ^.^ Hi!
Original post by p29
list all the values of x such that-1<2x<8
the <8 has a line under it btw
how do you work this out? i know how to do it for just x by itself but not 2x


just divide every term by 2 and you're done :biggrin:

Edit: oh, a troll
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Naruke
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Original post by p29
list all the values of x such that-1<2x<8
the <8 has a line under it btw
how do you work this out? i know how to do it for just x by itself but not 2x


−12<x≤4 -\frac{1}{2}<x\leq4

or you could sketch y=2x y = 2x from the points y = -1 and y = 8 and find the x values in that range...
Reply 4
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p29
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lol im famous
Reply 5
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p29
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im not trolling btw
Reply 6
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p29
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Original post by DylanJ42
just divide every term by 2 and you're done :biggrin:

Edit: oh, a troll

so i work out what only x is and then divide every result by 2?
X is a letter, silly.
Original post by p29
im not trolling btw


After that double negative nonsense it is hard to take you seriously. No offense.
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p29
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Original post by RDKGames
After that double negative nonsense it is hard to take you seriously. No offense.


:frown:
Original post by p29
:frown:


Anyway Naruke has given the correct answer above: -1/2 < x <= 4. (The "line under it" makes it greater than or equal to).
Regarding double negatives: 1 + -1 = 0 by the definition of 0, so -1 * (1 + -1) = 0 by multiplying both sides by -1.
Now expand the bracket: -1*1 + -1*-1 = 0, and evaluate -1*1 to give -1 + -1*-1 = 0. Now add 1 to both sides to give -1*-1 = 1, as required. It's not difficult to understand.

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