first move the 13 to the left by subtracting 13 from both sides and setting the 'now expression' equal to zero
p² - 12p - 13
Do the opposite of FOIL (for you are trying to find the numbers being FOILed)
p² - 12p - 13
Find the multiplies of the outside numbers/variables, that, when added (or subtracted, will give you the inside expression
p² - 12p - 13
p -13
p 1
(p - 13)(p + 1)
Set these two expressions equal to zero
p - 13 = 0
p - 13 (+13) = 0 (+13)
p = 13
p + 1 = 0
p + 1 (-1) = 0 (-1)
p = -1
Your answers: p = -1, 13
hope this helps
