Factor 500x^3+108

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baxthum8's profile pic

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

Posted on

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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atyourservice's profile pic

atyourservice | Student, Grade 11 | (Level 3) Valedictorian

Posted on

`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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