Question 116028
Hi Todd,

Recall that {{{ a^3 – b^3 = (a – b)(a^2 + ab + b^2) }}}

1. {{{ 125 - 8x^3 }}}

= {{{ 5^3 - 8x^3 }}}

= {{{(5 - 8x)(5^2 + 40x + 8x^2) }}} 

2. I'll let you try this one. Remember to use the sum of cubes formula!