Posted by Trina on Sunday, September 5, 2010 at 11:31am.
change b^9 to b^8*b
sqrt (5b^8*b)=b^4 sqrt5b
now cube all that.
b^12 (5b)sqrt5b
[sqrt(5 b^9]^3 = [(5 b^9)^(1/2)]^3
= 5^(3/2) * b^(9/2)
= 11.18034.. b^(9/2)
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