1.

16(a+6b)^2-9(a-3b)^2​

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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