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Factor 500x^3+108

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user5908353 | eNotes Newbie

Posted October 21, 2013 at 8:39 PM via web

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Factor 500x^3+108

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baxthum8 | High School Teacher | (Level 3) Associate Educator

Posted October 21, 2013 at 8:51 PM (Answer #1)

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Factor `500x^3 + 108` .

First, factor common factor of 4.

`4(125x^3+27)`

Now, notice that `125x^3` is perfect cube because `5^3` = 125 and `x^3` is a cube.  Also 27 is a cube as `3^3` = 27

Now apply the rule of the sum of cubes.

`a^3 + b^3 = (a + b)(a^2-2ab+b^2)`

This problem indicates `a = 5x` and `b = 3`

Therefore, `4(5x+3)(25x^2 -30x+9)`

The factored solution to `500x^3+108` is `4(5x+3)(25x^2 -30x+9)`

` `

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kingattaskus12 | (Level 3) Adjunct Educator

Posted November 15, 2013 at 2:36 AM (Answer #2)

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Factor out the GCF of `4` from each term in the polynomial.

`4(125x^3)+4(27)`


Factor out the GCF of `4` from `500x^3+108`

`4(125x^3+27)`


Since both terms are perfect cubes, the binomial can be factored using the sum of cubes formula: `a^3+b^3 = (a+b)(a^2-ab+b^2)`

The answer will be,
`4(5x+3)(25x^2-15x+9)`  

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atyourservice | Student , Grade 10 | eNoter

Posted February 28, 2014 at 10:11 PM (Answer #3)

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`500x^3+108  `

they both have 4 in common so factor out 4

`4(125x^3+27)`

these numbers are perfect cubes so use the cube formula and you will end up with

`4(5x+3)(25x^2-15x+9)`

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