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Factoring

Main Idea
FOIL - First Outer Inner Last
(A + B)(C + D)
A×C+A×D+B×C+B×D

Example Problems
(Both × and • symbols are multiplication)
Example 1:
(x+3)(x+3)
x•x+3•x+3•x+3•3
x²+3x+3x+9
x²+6x+9

Example 2:
(x-3)(x+3)
x•x+3•x-3•x-3•3
x²+3x-3x-9
x²-9

Practice Problems
Problem 1
(x+3)(x+4)
Solution


Problem 2
(2x+2)(x+4)
Solution