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# SoLvE

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Senior Manager
Joined: 30 Aug 2003
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SoLvE [#permalink]  30 Jan 2004, 13:49
Solve sqrt(7x^2 - 10x + 8) - sqrt(7x^2 - 10x - 4) = 2

a. -2
b. 7/4
c. 4/7
d. 8
e. none of these
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Manager
Joined: 25 Jan 2004
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Let k = 7x^2 - 10x - 4

sqrt(k+12) = 2 + sqrt(k)

k + 12 = 4 + k + 4sqrt(k)
==> k = 4
7x^2 - 10x - 8 = 0
7.8 = 56 = 14. 4

7x^2 - 14x + 4x - 8 = 0
(7x+2)(x-2) = 0

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Manager
Joined: 26 Dec 2003
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WOW SONALI BENDRE, HEY SUNNI SHE IS MY ALLTIME FAVORITE ACTRESS. okie now I am getting E) None of these as I am getting x=2, -4/7
Intern
Joined: 13 Aug 2003
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R1-> -4/7
R2-> 2

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