Answers

2014-08-12T08:29:43+08:00
Step 1
multiply first the first and last term

step 2
find the factors of the product that will result to the middle term

step 3
substitute the factors to the middle term

step 4
factor by grouping 

step 5 
add the cmf of the first binomial and the second binomial so that it will result to another binomial

step 6
copy the common binomial and the resulting binomial
0