Tricky P1 Maths Questions (debatable)

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BABYGUY
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#1
Report Thread starter 18 years ago
#1
Express in the form: p + q (root2) the following expression:

4 - 3(root2) / 5 - 3(root2)

i got an answer of: 14 - 21(root2)

correct or not?
please help!
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BABYGUY
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#2
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#2
if someone could solve this and compare their anwer to mine...thanks a million
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Bhaal85
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#3
Report 18 years ago
#3
(Original post by BABYGUY)
Express in the form: p + q (root2) the following expression:

4 - 3(root2) / 5 - 3(root2)

i got an answer of: 14 - 21(root2)

correct or not?
please help!
I got 4root2-6 / 5root2-6
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Bhaal85
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#4
Report 18 years ago
#4
(Original post by BABYGUY)
Express in the form: p + q (root2) the following expression:

4 - 3(root2) / 5 - 3(root2)

i got an answer of: 14 - 21(root2)

correct or not?
please help!
32-15root2
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Ralfskini
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#5
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#5
I get 2/7 - 3/7(root2)
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Bhaal85
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#6
Report 18 years ago
#6
(Original post by BABYGUY)
Express in the form: p + q (root2) the following expression:

4 - 3(root2) / 5 - 3(root2)

i got an answer of: 14 - 21(root2)

correct or not?
please help!
what are we doing, rationalising? are we also presuming f(x) = 0?
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BABYGUY
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#7
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#7
rationalising the surds yes, tehn by eradicating the fraction thingy you can simplify it into the form "p + q (root2)"...well thats the idea.
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Ralfskini
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#8
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#8
but i solved (4 - 3root2)/(5 - 3root2) and got the right answer for that!

presumably thats not what you meant!
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Bhaal85
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#9
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#9
(Original post by BABYGUY)
rationalising the surds yes, tehn by eradicating the fraction thingy you can simplify it into the form "p + q (root2)"...well thats the idea.
show me your working out.
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Ralfskini
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#10
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#10
otherwise its 4 and 18/5.
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Bhaal85
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#11
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#11
32-15root2
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BABYGUY
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#12
Report Thread starter 18 years ago
#12
ok, first before i show you my working out, i wanna check this:

Simplify:
2 - (5x + 2)

----> -10x - 4
----> -5x - 2

correct?
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Ralfskini
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#13
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#13
(Original post by BABYGUY)
ok, first before i show you my working out, i wanna check this:

Simplify:
2 - (5x + 2)

----> -10x - 4
----> -5x - 2

correct?
No.

-5x
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Bhaal85
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#14
Report 18 years ago
#14
(Original post by BABYGUY)
ok, first before i show you my working out, i wanna check this:

Simplify:
2 - (5x + 2)

----> -10x - 4
----> -5x - 2

correct?
Are you taking the p***???

2-(5x+2) = -5x
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BABYGUY
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#15
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#15
?? what about the 2 - *(+ 2)
doesnt this give -4??? nooo!!
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Ralfskini
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#16
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#16
(Original post by BABYGUY)
?? what about the 2 - *(+ 2)
doesnt this give -4??? nooo!!
yes, but how is that relevant.
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BABYGUY
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#17
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#17
i swear, i dont see how the 2 is cancelled out to leave -5x. omg.....
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Ralfskini
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#18
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#18
if u mean -2(2) then thats right...i assume thats what you meant
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Bhaal85
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#19
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#19
(Original post by BABYGUY)
?? what about the 2 - *(+ 2)
doesnt this give -4??? nooo!!
2-(5x+2) =

pretend the - is -1 therefore

-1(5x+2) + 2 =

-5x -2 +2 = -5x
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Ralfskini
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#20
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#20
(Original post by BABYGUY)
i swear, i dont see how the 2 is cancelled out to leave -5x. omg.....
Drop maths if i were you. lol
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