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16(a+6b)^2-9(a-3b)^2 |
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Answer» Answer:8a^2+246ab+495b^2 Step-by-step explanation: 16(a+6b)^2-9(a-3b)^2 =16{a^2+12ab+36b^2}-9{a^2-6ab+9b^2} =16a^2+192ab+576b^2-9a^2+54ab-81b^2 =a^2(16-9)+AB(192+54)+b^2(576-81) =8a^2+246ab+495b^2 |
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