Factor x² + 8x + 7 using the AC method
First, let's consider it as x² + bx + c. Now find a pair of integer whose product is c and whose sum is b. Your answer will be 1, 7.
Now we put x in the start of the equation like this (x, ?), (x, ?) because we have x² and then because our answer were the integers 1 and 7 we put 1 in the start and 7 in the end (I don't really think it matters where you put them but yeah...) so your final answer would be the following ------> (x, 1) (x, 7)
Hope I explained it very well. Enjoy!
