Multiply (2a-1)(a+1)

Math
(2a-1)(a+1)
Expand (2a-1)(a+1) using the FOIL Method.
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Apply the distributive property.
2a(a+1)-1(a+1)
Apply the distributive property.
2a⋅a+2a⋅1-1(a+1)
Apply the distributive property.
2a⋅a+2a⋅1-1a-1⋅1
2a⋅a+2a⋅1-1a-1⋅1
Simplify and combine like terms.
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Simplify each term.
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Multiply a by a by adding the exponents.
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Move a.
2(a⋅a)+2a⋅1-1a-1⋅1
Multiply a by a.
2a2+2a⋅1-1a-1⋅1
2a2+2a⋅1-1a-1⋅1
Multiply 2 by 1.
2a2+2a-1a-1⋅1
Rewrite -1a as -a.
2a2+2a-a-1⋅1
Multiply -1 by 1.
2a2+2a-a-1
2a2+2a-a-1
Subtract a from 2a.
2a2+a-1
2a2+a-1
Multiply (2a-1)(a+1)

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