Question 720561
{{{(a^3-2b) ^5}}}

={{{(a^3-2b)(a^3-2b)(a^3-2b)(a^3-2b)(a^3-2b)}}}

={{{(a^6-4a^3b+4b^2)(a^6-4a^3 b+4b^2)(a^3-2b)}}}

={{{(a^12-8a^9b+24a^6b^2-32a^3b^3+16b^4)(a^3-2b)}}}

={{{a^15-10a^12b+40a^9b^2-80a^6b^3+80a^3b^4-32b^5}}}