Multiply (a-9)(a+9)

Math
(a-9)(a+9)
Expand (a-9)(a+9) using the FOIL Method.
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Apply the distributive property.
a(a+9)-9(a+9)
Apply the distributive property.
a⋅a+a⋅9-9(a+9)
Apply the distributive property.
a⋅a+a⋅9-9a-9⋅9
a⋅a+a⋅9-9a-9⋅9
Simplify terms.
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Combine the opposite terms in a⋅a+a⋅9-9a-9⋅9.
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Reorder the factors in the terms a⋅9 and -9a.
a⋅a+9a-9a-9⋅9
Subtract 9a from 9a.
a⋅a+0-9⋅9
Add a⋅a and 0.
a⋅a-9⋅9
a⋅a-9⋅9
Simplify each term.
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Multiply a by a.
a2-9⋅9
Multiply -9 by 9.
a2-81
a2-81
a2-81
Multiply (a-9)(a+9)

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