Question

solve this problem........​

Answer 1

Answer:

Here is your answer

Step-by-step explanation:

....

= 9(x+y)²-16(x-y)²

=(3+x+y)² - (4+x+y)²

={3²+x²+y²+ 2×3×x + 2×x×y + 2×y×3} - {4²+x²+y²+2×4×x +2×x×y + 2×y×4}...(BY USING IDENTITY)

=9-16+6x-8x+6y-8y

=7-2x-2y

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