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a^{2}+3ab-b^{2}
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a^{2}+3ab-b^{2}
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a^{2}+3ab-4b^{2}+3b^{2}
Use the distributive property to multiply a+4b by a-b and combine like terms.
a^{2}+3ab-b^{2}
Combine -4b^{2} and 3b^{2} to get -b^{2}.
a^{2}+3ab-4b^{2}+3b^{2}
Use the distributive property to multiply a+4b by a-b and combine like terms.
a^{2}+3ab-b^{2}
Combine -4b^{2} and 3b^{2} to get -b^{2}.
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