A1= sqrt(7), a2= sqrt(42) find a5 and a formula for An
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A1= sqrt(7), a2= sqrt(42) find a5 and a formula for An

[From: ] [author: ] [Date: 12-12-14] [Hit: ]
......
someone plz help. thank u

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a1= sqrt(7), a2= sqrt(42)

a2= sqrt(42) = sqrt(7*6) == sqrt(7) *sqrt(6) = a1*sqrt(6)

a2 = a1*sqrt(6)
a3 = a2 * sqrt(6) = sqrt(42) * sqrt(6) = sqrt(7*(6^2))
a4 = a3 * sqrt(6) = 6sqrt(7) * sqrt(6) = sqrt(7*(6^3))
so ... An = sqrt{7*[6^(n-1)]}
a5 = sqrt(7*(6^4)) = 36sqrt(7)
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