I dont get it how can you do ab(a+b)?? I know with numbers but how with letters??Is that even an area or volume??
Multiply the part in front of the bracket (ab for you) by each term inside the bracket. (terms are separated by a + or a - ) So ab(a+b) a^2b+b^2a (^2 means squared)
ab(a + b) (a^2)*b + a*b^2 Now, you can answer your question.
