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Start with the given expression
Now let's foil the expression
Remember, when you FOIL an expression, you follow this procedure:
Multiply the First terms:
Multiply the Outer terms:
Multiply the Inner terms:
Multiply the Last terms:
Now collect every term to make a single expression
Now combine like terms
foils and simplifies to
In other words,
factors back to the original expression
(if you need help with factoring, check out this solver
). So this verifies our answer.