By using identities, find (5x-4 y)² + (5x + 4y)²3marks question plz – InterviewSolution

1.

By using identities, find (5x-4 y)² + (5x + 4y)²3marks question plz step by step

Answer»

(a+b)²⁼a²+b²+2ab

(5X-4Y)²=(5x)²+(4y)²-2(5x)(4y)

(25x+16y-40xy)

(5x+4y)² = (5x)²+ (4y)²+2(5x)(4y)

25x²+16y²+40xy

25x²+16y²-40xy+25x²+16y²+40xy

50x²+32y²

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