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Surds and Indices  TOPIC_SOLVED

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Surds and Indices

Postby JiaGengMaths on Thu Apr 19, 2012 8:25 am

Given that 3^(7/2)+3^(5/2)+3^(3/2)+42(3^1/2) may be expressed as 3^k find the value of k. (ans given states k=4.5)
I need to see how the answer is obtained. Thanks for helping. 8-)
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Re: Surds and Indices  TOPIC_SOLVED

Postby maggiemagnet on Fri Apr 20, 2012 1:13 pm

JiaGengMaths wrote:Given that 3^(7/2)+3^(5/2)+3^(3/2)+42(3^1/2) may be expressed as 3^k find the value of k. (ans given states k=4.5)
I need to see how the answer is obtained. Thanks for helping. 8-)

Start by factoring out the square root. Then add up what's left and put that into "a power of three" form.
:clap:
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