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a^{2}-2ab-b^{2}
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a^{2}-2ab-b^{2}
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3a^{2}-2ab-b^{2}-2a^{2}
Use the distributive property to multiply 3a+b by a-b and combine like terms.
a^{2}-2ab-b^{2}
Combine 3a^{2} and -2a^{2} to get a^{2}.
3a^{2}-2ab-b^{2}-2a^{2}
Use the distributive property to multiply 3a+b by a-b and combine like terms.
a^{2}-2ab-b^{2}
Combine 3a^{2} and -2a^{2} to get a^{2}.
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