How do you factor #x²+8x+7#?
To quickly factor it, we want to find two numbers that add up to
You might quickly see that the numbers we want are
Next, simply write 2 pairs of parenthesis and put "
Notice if you were to FOIL this out, you would get the original expression. In fact, what we just did was FOIL-ing backwards.
Find two numbers that when added equal