Expand (x-3)(x+7)
FOIL Method: F - First xx = x2 O - Outside x7=7x I - Inside -3x=-3x L - Last -37= -21 Add all the results up to get the answer: x2+7x-3x-21 = x2+4x-21
FOIL Method: F - First xx = x2 O - Outside x7=7x I - Inside -3x=-3x L - Last -37= -21 Add all the results up to get the answer: x2+7x-3x-21 = x2+4x-21
