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Source: — Problem Solving |
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by mental » Wed Jan 07, 2009 9:35 am
which expression?
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by umaa » Wed Jan 07, 2009 10:10 am
I'm sorry. Check it now.
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by iamcste » Wed Jan 07, 2009 10:20 am
A

you have already got the numerator

In denominator part,

expression = (1-x)(1-x)

=-1(x-1) * -1(x-1)

=(x-1)(x-1)

Numerator = (x+1)(x+1)

Choose A
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try plugging in

by yvichman » Wed Jan 07, 2009 10:21 am
it says X can't = 0 or 1
so plug in another # like 2

(2+1)^2 / (2-1)^2 = 9/1 = 9

now plug in (1/2+1)^2 / (1/2-1)^2 = (9/4) / (1/4) = 9 also

that means that the answer is the same as the original equation

A
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by rajataga » Wed Jan 07, 2009 11:00 am
Basically, what you were gettin is right...

Just go a step further...

(1-x)^2 = (x-1)^2.......because square will always be positive

Hence A
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