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FP2 june 2010 Q3b

https://8dedc505ac3fba908c50836f59059ccce5cd0f1e.googledrive.com/host/0B1ZiqBksUHNYdHIxUkJmdndfMlE/June%202010%20QP%20-%20FP2%20Edexcel.pdf

how is that x>-2, there is no explanation on mark scheme.

Could someone please explain it ti me?

many thanks.
Reply 1
Avatar for Zacken
Zacken
22
Original post by Kamisama
https://8dedc505ac3fba908c50836f59059ccce5cd0f1e.googledrive.com/host/0B1ZiqBksUHNYdHIxUkJmdndfMlE/June%202010%20QP%20-%20FP2%20Edexcel.pdf

how is that x>-2, there is no explanation on mark scheme.

Could someone please explain it ti me?

many thanks.


For x>−3x>-3 the inequality in (b) reduces to the inequality in (a).
Reply 2
Avatar for Kamisama
Kamisama
OP
Original post by Zacken
For x>−3x>-3 the inequality in (b) reduces to the inequality in (a).


sorry, i don't understand what you are saying.
Reply 3
Avatar for Zacken
Zacken
22
Original post by Kamisama
sorry, i don't understand what you are saying.


What is the definition of modulus?
Reply 4
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Kamisama
OP
Original post by Zacken
What is the definition of modulus?


something that makes everything positive.
Reply 5
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Kamisama
OP
Please help
I was about to make a thread about this, I'm also baffled at how it's easy to "deduce" instantly.
Reply 7
Avatar for Zacken
Zacken
22
Like I said, if you consider x>−3x > -3 then the inequality is the same as the inequality in (a).

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