T J.

asked • 08/23/16

27x^4+8x How to factor?

I need to know how to factor this step by step

1 Expert Answer

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Mark M. answered • 08/23/16

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27x4 + 8x
x(27x3 + 8)          
 
You now have the sum of cubes.
Do you know the general form?
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T J.

What does general form mean
Thank you for the response
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08/23/16

Mark M.

You are welcome:
a3 + b3 = (a + b)(a2 - ab + b2)
Look in your text book for
a2 - b2 = ?
a3 - b3 = ?
These are three of the general forms.
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08/23/16

T J.

Ohh yes I remember, factoring with sum of cubes and sums of squares now. 27 is a and 8 is b right?
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08/23/16

Philip P.

27x3 = (3x)3 = a3 , so a = 3x
8 = 23 = b3, so b = 2
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08/23/16

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