Question

factoring a sum/different cubic.
a^3+125

Answer 1

hi

Answer 2

please help

Answer 3

\[a^3+5^3 = (a+5)(a^2-5a+25)\]
you use the formula:
\[x^3+y^3 = (x+y)(x^2-xy+y^2)\]
where x = a, and y = 5

Answer 4

ok thank you very much

Answer 5

you great

Answer 6

btw it is best to memorize
\[a^3+b^3=(a+b)(a^2-ab+b^2)\] and
\[a^3-b^3=(a-b)(a^2+ab+b^2)\] because it is unlikely that you will be able to derive these for yourself on the fly

Answer 7

and yes. joemath is great!

Answer 8

ok I will remember. Thanks

Answer 9

you great too