Question

Q-4 Solve the following.
1)
By using identities, find (5x-4y)² + (5x+4y)²
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Answer 1

$= 25 x {}^{2}+ 16y {}^{2} - 40xy + 25 x {}^{2} + 16y {}^{2} + 40xy =50x {}^{2} + 32y {}^{2}$

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