Question 734754
<pre>
4x<sup>4</sup> – 500x

Factor out 4x

4x(x<sup>3</sup> – 125)

125 = 5<sup>3</sup>, so replace 125 by 5<sup>3</sup>

4x(x<sup>3</sup> – 5<sup>3</sup>)

Learn the rule for factoring the sum or difference of two cubes:

        A<sup>3</sup> ± B<sup>3</sup> = (A ± B)(A<sup>2</sup> &#8723; AB + B<sup>2</sup>)

4x(x – 5)(x<sup>2</sup> + 5x + 5<sup>2</sup>)

4x(x – 5)(x<sup>2</sup> + 5x + 25)

Edwin</pre>