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by beater » Sun Jan 04, 2009 12:59 pm
if sqrt(3-2x) = sqrt(2x) + 1 then, 4(x)^2

a. 1
b. 4
c. 2-2x
d. 4x-2
e. 6x-1
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by cramya » Sun Jan 04, 2009 1:05 pm
sqrt(3-2x) = sqrt(2x) + 1

Square both sides

3-2x = 2x+1+2 sqrt(2x)

2-4x = 2 sqrt(2x)

2(1-2x) = 2 sqrt(2x)

1-2x = sqrt(2x)

Square again

1+4 x^2 -4x = 2x

4x^2 = 6x-1

Choose E)
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