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January 30, 2015

January 30, 2015

Posted by **helen** on Thursday, November 3, 2011 at 2:46pm.

- maths -
**Steve**, Thursday, November 3, 2011 at 6:19pmsince 32 = 2^5,

sqrt(32) = 32^(1/2) = (2^5)^(1/2) = 2^(5/2)

16^(x-1) = 2 * 2^(5/2) = 2^(1 + 5/2) = 2^(7/2)

16 = 2^4

2^(4x-4) = 2^(7/2)

so,

4x-4 = 7/2

8x-8 = 7

8x = 15

x = 15/8

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